Physics: Light, Reflection, and Refraction

Questions and Answers

The atmosphere scatters all colors of light equally at noon. (correct)

Red light is scattered the least at noon.

Blue light is scattered the least at noon.

The sun emits mostly white light at noon.

Dispersion of light by water droplets in the atmosphere.

Refraction of light by layers of air with varying densities. (correct)

Diffraction of light by dust particles in the atmosphere.

Reflection of light by clouds.

The atmosphere scatters red and orange light more strongly than other colors.

The atmosphere scatters violet and blue light more strongly than other colors. (correct)

The atmosphere absorbs ultraviolet radiation more strongly than other colors.

The atmosphere absorbs blue light more strongly than other colors.

Red light is scattered the least by smoke and fog, ensuring visibility even in hazy conditions. Signup and view all the answers

Shorter wavelengths of light are scattered more than longer wavelengths. Signup and view all the answers

Sunlight passing through a clear, dry atmosphere. Signup and view all the answers

The temperature of the surrounding environment. Signup and view all the answers

Red. Signup and view all the answers

The sky appears blue because the atmosphere scatters blue light more strongly than other colors. Signup and view all the answers

Black. Signup and view all the answers

Study Notes

A concave mirror of focal length 20 cm will produce a real and inverted image with a magnification of -2 if the object is at a distance of 30 cm from the pole.
The focal length of a plane mirror is infinity.
A concave spherical mirror of radius of curvature 120 cm will produce an erect image four times the natural size if the object is at a distance of 240 cm from the mirror.
When a light ray enters from medium A to medium B, the refractive index of medium B relative to A is greater than unity.
A 2cm pin placed 10 cm in front of a concave mirror of focal length 10 cm will produce an erect image 4 cm in height.

A concave mirror has a centre of curvature, pole, and focus, whereas a convex lens has a principal axis, focus, and radius of curvature.
A concave lens having 4 dioptre power has a focal length 0.25 m, whereas a concave lens having -4 diopter power has a focal length -0.25 m.
When a ray of light travels from a rarer medium to a denser medium, it bends towards the normal.
The path of a ray of light passing through a rectangular glass slab is traced by drawing a straight line.

A convex lens of focal point 15 cm has a power of 6.67 D.
A combination of a convex lens of power +3.5 D and a concave lens of power -2.5 D will behave like a convergent lens of focal length 200 cm.
A device X that forms an image of a distant object on a white screen at a distance of 30 cm is a convex lens of focal length 15 cm.
A convex lens forms a virtual image of an object placed at a distance of 20 cm, and the focal length of the lens must be greater than 20 cm and less than infinity.

When a ray of light passes from air into a denser medium, it deviates towards the normal.
A glass slab placed over a page with printed letters will raise the image of the letters, with the letter V raised the most.
A rainbow is caused by the dispersion of sunlight from water drops.
When sunlight enters a glass prism, it is deviated and dispersed.
The clear sky appears blue because blue light is scattered more than other colours by the atmosphere.

A person who cannot see objects beyond 2 m can be corrected using a lens of power -0.5 D.
Twinkling of stars is due to the refraction of light by different layers of the atmosphere with varying refractive indices.
The danger signals installed at the top of tall buildings are red in colour because red light is scattered the least by smoke or fog.