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Ashok0210

Asked: March 21, 2021In: Class 12 Physics

You have learnt in the text how Huygens’s principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.13 NCERT Solutions for Class 12 Physics Chapter 10 Question-13 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.12 NCERT Solutions for Class 12 Physics Chapter 10 Question-12 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

The 6563 Aº Ha line emitted by hydrogen in a star is found to be red shifted by 15 Aº. Estimate the speed with which the star is receding from the Earth.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.11 NCERT Solutions for Class 12 Physics Chapter 10 Question-11 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.10 NCERT Solutions for Class 12 Physics Chapter 10 Question-10

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Light of wavelength 5000 Aº falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.9 NCERT Solutions for Class 12 Physics Chapter 10 Question-9

Akaljeet

Asked: March 19, 2021In: Class 7 Maths

Solve the following riddle: I am a number, Tell my identity! Take me seven times over, And add a fifty! To reach a triple century, You still need forty!

NCERT Solutions for Class 7 Mathematics Chapter 4 Important NCERT Questions Class vii Math Chapter 4 Simple Equations Exercise 4.4 NCERT Books for Session 2022-2023 CBSE Board Questions No: 4

Akaljeet

Asked: March 19, 2021In: Class 7 Maths

Solve the following: (i) Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. How many marbles does Parmit have?

NCERT Solutions for Class 7 Mathematics Chapter 4 Important NCERT Questions Class vii Math Chapter 4 Simple Equations Exercise 4.4 NCERT Books for Session 2022-2023 CBSE Board Questions No: 3

Akaljeet

Asked: March 19, 2021In: Class 7 Maths

Solve the following: (a) The teacher tells the class that the highest marks obtained by a student in her class are twice the lowest marks plus 7. The highest score is 87. What is the lowest score? (b) In an isosceles triangle, the base angles are equal. The vertex angle is 40° What are the base angles of the triangle? (Remember,the sum of three angles of a triangle is 180°) (c) Sachin scored twice as many runs as Rahul. Together, their runs fell two short of a double century. How many runs did each one score?

NCERT Solutions for Class 7 Mathematics Chapter 4 Important NCERT Questions Class vii Math Chapter 4 Simple Equations Exercise 4.4 NCERT Books for Session 2022-2023 CBSE Board Questions No: 2

Akaljeet

Asked: March 19, 2021In: Class 7 Maths

Set up equations and solve them to find the unknown numbers in the following cases: (a) Add 4 to eight times a number; you get 60. (b) One-fifth of a number minus 4 gives 3.

NCERT Solutions for Class 7 Mathematics Chapter 4 Important NCERT Questions Class vii Math Chapter 4 Simple Equations Exercise 4.4 NCERT Books for Session 2022-2023 CBSE Board Questions No: 1

Akaljeet

Asked: March 19, 2021In: Class 7 Maths

(a) Construct 3 equations starting with x =2. (b) Construct 3 equations starting with x= -2.

NCERT Solutions for Class 7 Mathematics Chapter 4 Important NCERT Questions Class vii Math Chapter 4 Simple Equations Exercise 4.3 NCERT Books for Session 2022-2023 CBSE Board Questions No: 4

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Aagar

Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

The 6563 Aº Ha line emitted by hydrogen in a star is found to be red shifted by 15 Aº. Estimate the speed with which the star is receding from the Earth.

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.

Light of wavelength 5000 Aº falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Solve the following riddle: I am a number, Tell my identity! Take me seven times over, And add a fifty! To reach a triple century, You still need forty!

Solve the following: (i) Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. How many marbles does Parmit have?

Set up equations and solve them to find the unknown numbers in the following cases: (a) Add 4 to eight times a number; you get 60. (b) One-fifth of a number minus 4 gives 3.

(a) Construct 3 equations starting with x =2. (b) Construct 3 equations starting with x= -2.

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