Dispersion of Light
The use of total internal ‘reflection’ of light is to
shape diamonds
straighten mirrors
check the surface of glass
check the density of liquids
shape diamonds
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The speed of light in ‘vacuum’ isA. 3,000 km/s
B. 30,000 km/s
C. 300,000 km/s
D. 3,000,000 km/s
Things that give off light are known as
A. non luminous objects
B. luminous objects
C. transparent objects
D. opaque objects
We see different colors on screen because dots change their
A. colors
B. brightness
C. sharpness
D. size
The sensitive screen at the back of eye is called
A. blind spot
B. conjunctiva
C. cornea
D. retina
When light enters water from air, its speed decreases to
A. 20,000 km/s
B. 25,000 km/s
C. 200,000 km/s
D. 250,000 km/s
The number of red cells in an eye is
A. 320 million
B. 120 million
C. 220 million
D. 200 million
The critical angle is basically the
A. angle of incidence
B. angle of refraction
C. angle of reflection
D. angle of rarefaction
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