light

When a ray of light entering from air is incident on the surface of a glass slab at an angle of 90°, the measure of angle of refraction=

The type of mirror used in reflector in automobile lights is

• Plane mirror

• Concave mirror

• Convex mirror

• None of the above

A mirror having focal length –15 cm is _________________

• Plane mirror

• Concave mirror

• Convex mirror

• None of these

A mirror having focal length –15 cm is _________________

• Plane mirror

• Concave mirror

• Convex mirror

• None of these

Assertion: For observing the traffic at the hairpin bend in the mountains a plane mirror is preferred over convex or concave mirror.

Reason: A convex mirror has a much larger field view than a plane mirror or a concave mirror.

• Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

• Assertion is true but Reason is false.

• Assertion is false but Reason is true.

Which of the following characteristics are correct for the image formed in a plane mirror?

I. Upright

II. Inverted

III. Real

IV. Same size as the object

V. Virtual

• I, II, III

• I, III, IV

• I, IV, V

• III, IV, V

A ray of light travels from air into a glass block.

Which diagram correctly shows the path of the ray through the glass block?

• A

• B

• C

• D

Why does the straw appear to be bent?

• light is reflected

• light is absorbed

• light is turned

• light is refracted

The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-

• absorbed
• stopped
• reflected
• refracted

Glass has a _____________ index of refraction than air.

• Equal
• Greater
• Less
• Impossible to say