light test

What are the characteristics of image formed by plane mirror?

• The image is inverted.

• The image is magnified

• The image is virtual

• The distance of image from mirror is equal to the distance of object from the mirror

There are two laws of reflection of light.

Select these from the following:

• The incident ray, the normal and the reflected ray at the point of incidence, all lie in the same plane.

• The angle of incidence is greater than the angle of reflection.

• The angle of incidence plus the angle of reflection add up to 90^o

• The angle of incidence is equal to the angle of reflection.

On ambulance, its name is written such that it can be read in the rear view mirror of the car in front. This phenomenon is known as

• parallax

• a virtual image

• lateral inversion

• Inverted

Which one of the following diagrams (of an F-shaped object and a plane mirror) shows the image drawn correctly ?a

• A

• B

• C

• D

• E

The diagram shows a ray of light being reflected by a plane mirror.

The angle of reflection is:

• 55⁰

• 110^o

• 70^o

• 35^o

A light ray strikes a mirror as shown in the diagram.

Identify the numbered parts.

• 1 = angle of reflection, 2 = normal

• 1 = angle of incidence, 2 = incident ray

• 1 = angle of reflection, 2 = incident ray

• 1 = angle of incidence, 2 = reflected ray

A ray of light strikes a plane mirror as shown. The angle of reflection is

• 60^o

• 45^o

• 30^o

• 15^o

What is critical angle?

• The critical angle is the angle of incidence in an optically denser medium for which the angle of reflection is 90^o

• The critical angle is the angle of incidence in an optically denser medium for which the angle of refraction is 90^o

• The critical angle is the angle of incidence in an optically rarer medium for which the angle of refraction is 90^o

Define total internal reflection.

• When angle of incidence is greater than critical angle, all the light ray is reflected internally

• When angle of incidence is smaller than critical angle, all the light ray is reflected internally

• When angle of incidence is equal to critical angle, all the light ray is reflected internally

Define refractive index of a medium.

• Ratio of speed of light in vacuum to the speed of light in any given medium

• Ratio of the speed of light in any medium to the speed of light in vacuum.