Mirrors Quiz part 2

The parallel rays that are incident on the plane mirror are reflected back as .......... rays.

• parallel

• converging

• scattering

• diverging

The Romans used a huge optical piece to burn the sails of enemies' ships by using the Sun rays. What is the suitable optical piece to do that?

• Convex mirror

• Concave mirror

• Plane mirror

• Flat glass

The focal length of the mirror is the distance between ..........

• the mirror and the light source

• the mirror and the object

• the focus of the mirror and its surface

• the centre of curvature of the mirror and its pole

The focal length of a spherical mirror equals .......... its radius of curvature.

• double

• half

• quarter

• three times

A concave mirror of focal length 5 cm, its diameter of curvature equals ..........

• 15 cm

• 10 cm

• 25 cm

• 5 cm

A concave mirror was cut from a hollow spherical glass ball of diameter 20 cm, its focal length is .......... cm.

• 5

• 10

• 15

• 20

A spherical mirror whose radius is 60 cm, its focal length is equal to ..........

• 90 cm

• 60 cm

• 120 cm

• 30 cm

The reflecting surface of the convex mirror is ..............

• part of outer sphere

• part of inner sphere

• part of flat surface

• part of a cylinder

Spherical mirrors are part of ..........

• cones

• spheres

• cubes

• rectangles

A concave mirror has a focal length of 8 cm. An object is placed in front of this mirror forming an image at a distance 20 cm from the mirror. So the distance between the object and the mirror equals ..........

• 8 cm

• 4 cm

• 12 cm

• 16 cm