Lumen is the unit of luminous flux, which measures the total amount of visible light emitted by a light source per unit of time. It quantifies the brightness of light as perceived by the human eye, regardless of the direction ...
Category: Class 10 Science
NCERT Solutions for Class 10 Science and important questions for CBSE class 10 for session 2020-2021
Tiwari Academy Discussion Latest Questions
A person suffering from a distance of less than 1 meter is suffering from nearsightedness. Nearsightedness, or myopia, is a vision condition where close objects are seen clearly, but distant objects appear blurry. This occurs because the eye focuses light ...
A person unable to see an object more than 10 meters away is suffering from myopia. Myopia, or nearsightedness, causes distant objects to appear blurry while close objects are clear. This occurs because the eye focuses light in front of ...
A concave lens always forms a virtual image. This is because it diverges light rays, causing them to spread out. When the diverged rays are traced back, they appear to originate from a single point on the same side of ...
The spectacles used for a person suffering from nearsightedness (myopia) are concave lenses. Concave lenses are thinner at the center and thicker at the edges, diverging light rays entering the eye. This helps move the focal point backward onto the ...
A person suffering from farsightedness (hyperopia) has difficulty seeing nearby objects clearly. Hyperopia occurs when light entering the eye is focused behind the retina, causing nearby objects to appear blurry. This condition can often be corrected with convex lenses, which ...
The minimum distance of clear vision for a healthy eye is 25 cm. This is known as the near point of the eye, where objects can be seen clearly without strain. It allows the eye to focus on close objects ...
If a person cannot see distant objects clearly, the defect in vision is near sightedness. Near sightedness, or myopia, occurs when light entering the eye is focused in front of the retina instead of directly on it, causing distant objects ...
A person suffering from nearsightedness (myopia) can see nearby objects clearly but has difficulty seeing distant objects. Myopia occurs when light entering the eye is focused in front of the retina, causing distant objects to appear blurred. This condition can ...
The color of an opaque object is due to the color which it absorbs. When light strikes an opaque object, certain wavelengths (colors) of light are absorbed by the object’s surface material. The remaining wavelengths are reflected or scattered, giving ...