Light

What types of reflecting surfaces are the laws of reflection applicable to?

• Only plane mirrors

• Only spherical mirrors

• Both plane and spherical mirrors

• All types of reflecting surfaces.

The focal length of a plane mirror is

• 0

• infinite

• 25 cm

• -25 cm

In which of the following is a concave mirror used ?

• A solar cooker

• A rear view mirror in the vehicles.

• A safety mirror in shopping malls

• In viewing full size image of distant tall buildings.

The image of an object placed in front of a convex mirror is formed at

• the object itself

• twice the distance of the object in front of the mirror

• half the distance of the object in front of the mirror

• behind the mirror

Rahul conducts an experiment using an object of height of 10 cm and a concave mirror with a focal length of 20 cm. The object is placed at a distance of 25 cm from the lens. Where will the image be formed?

• Between 20 cm and 40 cm

• Between 0 and 20 cm

• At 20 cm

• Beyond 40 cm

Where would the reflected rays meet for the image formation to take place?

• Behind the mirror

• Between F and O

• Between C and F

• Beyond C

Which statement is true for the reflection of light?

• The angle of incidence and reflection are equal.

• The reflected light is less bright than the incident light.

• The sum of the angle of incidence and reflection is always greater than 90.

• The beams of the incident light, after reflection, diverge at unequal angles.

The radius of curvature of a mirror is 20 cm. The focal length is

• 20 cm

• 40 cm

• 10 cm

• 15 cm

The centre of curvature of a concave mirror

• is a point at the centre of the reflecting surface.

• lies behind the reflecting surface.

• lies in front of the reflecting surface.

• is the diameter of the reflecting surface.

What will be the angle between the incident ray and the reflected ray?

• 60

• 120

• 30

• 90