Optics Answers

Light is a form of energy that -------


is transported from place to place due to the temperature gradient
requires material media for its propagation
stimulates the sensation of sight
cannot be difrracted

Which of the following is NOT correct?

light is a longitudinal wave
light is a tranverse wave
light is an electromagnetic wave
light can exhibit the phenomenon of polarisation

The speed of light in glass is approximately ---------- that in air


100 times faster than
100 times slower than
50 per cent faster than
33 percent slower than

The property of light waves that detrmines its brightness is its -----------

wavelength
velocity
frequency
amplitude

Telescopes that use mirrors as the objectives are known as -----------

refractors
reflectors
Galilean telescopes
terrestial telescopes

How far from a magnifying glass do you place an object to view it?

closer than than the focal length
distance equal to the focal length
greater than the focal length but less than twice the focal length
at twice the focal length

How many diopters are there for for a converging lens with a focal length of 0.4m?

−2.5
−0.4
+0.4
+2.5

The critical angle for total internal reflection at an air-water interface is approximately 48 degrees. In which of the following situations will total internal reflection occur?

light incident in water at 40 dgrees
light incident in water at 55 dgrees
light incident in air at 40 dgrees
light incident in air at 55 dgrees

If the sun is 150 million km away from the earth, how long does it take sunlight to reach the earth?

0.5 s
1500 s
45 s
500 s

Where is the image located when an object is 60 cm from a convex mirror with a focal length of20 cm?

15 cm behind
30 cm behind
60 cm behind
15 cm in front