Term 1 Revision

A beam of light strikes a surface and undergoes reflection from smooth, shiny and polished surface. The kind of reflection is

• Irregular

• Diffused

• Regular

• Reflection is always irregular irrespective of the nature of surface

A ray of light incident on a plane mirror makes 600 angle with the surface of the mirror. What is the angle between the incident ray and the reflected ray? Will the plane containing the reflected ray be the same as the plane containing incident ray?

• 30 degrees

• 60 degrees

• 90 degrees

• 45 degrees

What should be the angle of incidence for a ray of light to retrace its path after reflection?

• 90 degress

• 0 degrees

• 45 degrees

• 180 degrees

Assertion (A): A convex mirror forms a virtual image always.

Reason(R): A convex mirror is a diverging mirror.

• Both A and R are correct and R is the correct explanation of A

• Both A and R are correct but R is not the correct explanation of A

• A is true and R is false

• A is false and R is true

What should be the position of a source of light in front of a concave reflector to obtain a parallel beam of light?

• At infinity

• At C

• Between C and F

• At F

In which of the following uses a concave mirror/reflector is useful?

• Mirror at the turning of a parking lot

• Dentist's mirror

• Reflector of street light

• Side rear view mirror of a car

In which of the following uses a convex mirror/reflector is useful?

• Doctors head mirror

• Shaving mirror

• Reflector of a torch

• Vigilance mirror at a departmental store

An object is placed at a distance of 15 cm in front of a convex mirror of focal length 5 cm.

Where will the image form?

• 3.75 cm in front of the mirror

• 3.75 cm behind the mirror

• 5 cm in front of the mirror

• 5 cm behind the mirror

An object is placed at a distance of 15 cm in front of a convex mirror of focal length 5 cm.

b. Find the magnification

• +4

• -4

• +1/4

• -1/4

To obtain the image at a maximum distance from a convex mirror, what should be the distance of the object in front of the mirror?

• At F

• Between F and C

• At C

• At infinity