Physics - Study Mode

[#431] What type of lens is a magnifying glass?
Correct Answer

(C) Converging

Explanation

Solution: A magnifying glass (called a hand lens in laboratory contexts) is a convex or converging lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle.

[#432] Which of the following is not caused by atmospheric refraction of light ?
Correct Answer

(C) Sun appearing higher in the sky than it actually is

Explanation

Solution: The twinkling of stars and variation in size of the Sun are due to atmospheric refraction of light. Besides, refraction is also responsible for the sun to look during sunset and sunrise. It is also responsible for the sun becoming two or three minutes before actual sunrise. The sun appears higher or lower in the sky due to the changing position of the Earth relative to the Sun.

[#433] Why does water tank appear shallower when viewed from the top?
Correct Answer

(B) Due to refraction

Explanation

Solution: The bending of light (i.e. refraction of light) as it moves from water to air makes the water tank appear to be less shallower than its real depth.

[#434] Which one of the following processes is responsible for the glittering of air bubble rising through water?
Correct Answer

(C) Total internal reflection of light

Explanation

Solution: Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.

[#435] The increasing order of the refractive index of certain materials is (left to right) ________
Correct Answer

(C) Ice, Kerosene, Benzene, Rock Salt

Explanation

Solution: The increasing order of the refractive index of certain materials is (left to right) Ice, Kerosene, Benzene, Rock Salt.