Light : Reflection & Refraction

When light falls on a smooth polished surface, most of it

• (a) is reflected in the same direction

• (b) is reflected in different directions

• (c) is scattered

• (d) is refracted into the second medium

A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:

• (a) at infinity

• (b) at focus

• (c) at the pole

• (d) behind the mirror

A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be

• a) both concave

• (b)the mirror is convex and the lens is concave

• (c) the mirror is concave and the lens is convex

• (d) both convex

If the magnification produced by a lens has a negative value, the image will be

• (a) virtual and inverted

• (b) virtual and erect

• (c) real and erect

• (d) real and inverted

Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is

• A) Minus 30 cm

• B) Plus 30 cm

• C) Minus 15 cm

• A) Minus 30 cmD) Plus 30 cm

Which of the following is NOT a characteristic feature of a convex mirror?

• A) The image is virtual

• B) The image is diminished in size.

• C) The image is erect.

• D) The image is real.

Complete the path of the refracted ray of the given incident light on the given convex lens.

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Which of the following can form enlarged, virtual images?

• A) Convex mirrors

• B) Concave mirrors

• C) Plane mirrors

• D) Concave lens

Which of the following are uses for convex lenses? (Choose all that are correct)

• Camera lens

• Telescope lens

• Microscope lens

• Magnify glass

In absolute refractive index we compare the speed of light of a medium with the speed of light in__________.

• Water

• Glass

• Vacuum

• Diamond