To focus a distant object (like a lamp on a faraway electric pole) using a convex lens, the lens needs to be moved away from the screen. This is because a convex lens converges parallel rays of light to a point called the focal point. For distant objects, the incoming light rays can be considered asRead more
To focus a distant object (like a lamp on a faraway electric pole) using a convex lens, the lens needs to be moved away from the screen. This is because a convex lens converges parallel rays of light to a point called the focal point. For distant objects, the incoming light rays can be considered as nearly parallel.
Here’s a step-by-step explanation:
1) Converging Property: A convex lens has the property of converging parallel rays of light. When the lens is closer to the screen, the incoming rays from the distant object will converge too early, and you won’t get a sharp image on the screen.
2) Focal Point Adjustment: By moving the convex lens away from the screen, you are effectively adjusting the focal point of the lens for the distant object. The lens needs to be positioned in such a way that the parallel rays converge exactly at the location of the screen.
3) Sharp Image Formation: The goal is to ensure that the rays from the distant object converge to a sharp image on the screen. This is achieved by adjusting the lens position.
In summary, to focus a distant lamp on a faraway electric pole, move the convex lens towards the screen. As the distance of object increased, the image formed by a convex lens will be more close to the focus.
(i) No, magnified image of an object cannot be formed by a concave lens ever. (ii) An object be placed in case of a convex lens to form an image of same size as of the object - At 2f. (iii) Image obtained is virtual, erect and diminished in case of concave lens. Like...pls...👍👍👍
(i) No, magnified image of an object cannot be formed by a concave lens ever.
(ii) An object be placed in case of a convex lens to form an image of same size as of the object – At 2f.
(iii) Image obtained is virtual, erect and diminished in case of concave lens.
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells. When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferatRead more
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells.
When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferate; mass of cells get differentiated into various cells and tissues.
Another example of an organism showing the characteristics is Hydra. Diagram:
• Isomers: Compounds which have same molecular formula and different structural formula. • In first three members of alkane series, branching is not possible, therefore isomers are not possible. • Two isomers of butane C4H10.
• Isomers: Compounds which have same molecular formula and different structural formula.
• In first three members of alkane series, branching is not possible, therefore isomers are not possible.
• Two isomers of butane C4H10.
f= -10cm (since the image is formed at the focus) Now u= - 20cm, i,e. the candle flame is at C Therefore, the image would form at C and would be of the same size. Ray diagram :
f= -10cm (since the image is formed at the focus)
Now u= – 20cm, i,e. the candle flame is at C
Therefore, the image would form at C and would be of the same size. Ray diagram :
1) Facial Hair Growth: One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This isRead more
1) Facial Hair Growth:
One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This is driven by the influence of androgens, such as testosterone.
2) Adam’s Apple:
Another secondary sexual characteristic that distinguishes males from females is the Adam’s apple. The Adam’s apple, or laryngeal prominence, is a noticeable protrusion in the throat area, specifically in the front of the larynx. It becomes more prominent during puberty in males due to the growth of the laryngeal cartilage, which is influenced by the increase in testosterone levels. Females also have a laryngeal prominence, but it is generally less prominent than in males.
A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.
To focus a distant object (like a lamp on a faraway electric pole) using a convex lens, the lens needs to be moved away from the screen. This is because a convex lens converges parallel rays of light to a point called the focal point. For distant objects, the incoming light rays can be considered asRead more
To focus a distant object (like a lamp on a faraway electric pole) using a convex lens, the lens needs to be moved away from the screen. This is because a convex lens converges parallel rays of light to a point called the focal point. For distant objects, the incoming light rays can be considered as nearly parallel.
Here’s a step-by-step explanation:
1) Converging Property: A convex lens has the property of converging parallel rays of light. When the lens is closer to the screen, the incoming rays from the distant object will converge too early, and you won’t get a sharp image on the screen.
2) Focal Point Adjustment: By moving the convex lens away from the screen, you are effectively adjusting the focal point of the lens for the distant object. The lens needs to be positioned in such a way that the parallel rays converge exactly at the location of the screen.
3) Sharp Image Formation: The goal is to ensure that the rays from the distant object converge to a sharp image on the screen. This is achieved by adjusting the lens position.
In summary, to focus a distant lamp on a faraway electric pole, move the convex lens towards the screen. As the distance of object increased, the image formed by a convex lens will be more close to the focus.
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See less(i) Rohit claims to have obtained an image twice the size of object with a concave lens. Is he correct? Give reason for your answer. (ii) Where should an object be placed in case of a convex lens to form an image of same size as of the object? Show with the help of ray diagram the position and the nature of the image formed. (iii) With the help of ray diagram, illustrate the change in position, nature and size of the image formed if the convex lens in case of (ii) is replaced by concave lens of same focal length.
(i) No, magnified image of an object cannot be formed by a concave lens ever. (ii) An object be placed in case of a convex lens to form an image of same size as of the object - At 2f. (iii) Image obtained is virtual, erect and diminished in case of concave lens. Like...pls...👍👍👍
(i) No, magnified image of an object cannot be formed by a concave lens ever.
(ii) An object be placed in case of a convex lens to form an image of same size as of the object – At 2f.
(iii) Image obtained is virtual, erect and diminished in case of concave lens.
Like…pls…👍👍👍
See lessA concave lens has a focal length of 50 cm. Calculate its power.
Where f is the focal length of the lens.
Where f is the focal length of the lens.
See lessExplain with the help of labelled diagrams the development that takes place in each of the body parts of a Planaria where body is cut into three pieces. None this process and give an example of an organism in which a similar process can be observed.
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells. When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferatRead more
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells.
When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferate; mass of cells get differentiated into various cells and tissues.
See lessAnother example of an organism showing the characteristics is Hydra. Diagram:
An organic compound ‘X’ is a liquid at room temperature. It is also a very good solvent and has the molecular formula C2 H6 O. on oxidation ‘X’ gives ‘Y’ which give, break effervescence on reacting with NaHCO3. X reacts with Y in the presence of conc.H2SO4to give another compound ‘Z’ which has a pleasant smell. Identify X, Y and Z. Also write chemical equations to show the formation of Y and Z.
X- Ethanol C2H5OH Y- Ethanoic acid CH3COOH Z- Ester CH3COOC2H5
X- Ethanol C2H5OH
See lessY- Ethanoic acid CH3COOH
Z- Ester CH3COOC2H5
What are isomers? “Isomers of the first three members of alkane series are not possible”. Give reason to justify this statement and draw structures of two isomers of butane, C4 H10.
• Isomers: Compounds which have same molecular formula and different structural formula. • In first three members of alkane series, branching is not possible, therefore isomers are not possible. • Two isomers of butane C4H10.
• Isomers: Compounds which have same molecular formula and different structural formula.
See less• In first three members of alkane series, branching is not possible, therefore isomers are not possible.
• Two isomers of butane C4H10.
When a concave mirror is placed facing Sunlight, the Sun’s rays or sun light converge to a point 10 cm from the mirror. Now, if you place 2 cm long candles flame 20 cm away on the principal axis of the mirror, where would you specify a place a screen to obtain the image of the candle? What would see the size of a image? Draw a ray diagram to justify your answer.
f= -10cm (since the image is formed at the focus) Now u= - 20cm, i,e. the candle flame is at C Therefore, the image would form at C and would be of the same size. Ray diagram :
f= -10cm (since the image is formed at the focus)
See lessNow u= – 20cm, i,e. the candle flame is at C
Therefore, the image would form at C and would be of the same size. Ray diagram :
List two secondary sexual characters of males that are different from that of females.
1) Facial Hair Growth: One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This isRead more
1) Facial Hair Growth:
One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This is driven by the influence of androgens, such as testosterone.
2) Adam’s Apple:
Another secondary sexual characteristic that distinguishes males from females is the Adam’s apple. The Adam’s apple, or laryngeal prominence, is a noticeable protrusion in the throat area, specifically in the front of the larynx. It becomes more prominent during puberty in males due to the growth of the laryngeal cartilage, which is influenced by the increase in testosterone levels. Females also have a laryngeal prominence, but it is generally less prominent than in males.
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