PRACTICE QUESTIONS FOR TUTORIAL 4

An object is positioned between two plane mirrors inclined at right angles to each other. The object 1 unit distance from the each mirror. The number of images formed is

• 3
• 4
• 2
• 1

An engineer intends to deviate a light ray from its path 120 degree through reflection from plane mirror. Calculate the angle of incidence.

• 30 degrees
• 120 degrees
• 60 degrees
• 90 degrees

The magnification of an object 2cm tall when placed 10cm in front of a plane mirror is

• 2
• 3
• 1
• 0.5

A man standing between two parallel mirrors in a barber's shop will see the following number of his own image

• one
• infinite
• two
• three

Which of the following statements is NOT true of the image in a plane mirror? The image is

• the same size as the object

• laterally inverted

• virtual

• magnified

The plane mirrors in a kaleidoscope are usually placed

• at a right angle, usually 90 degrees
• parallel to each other
• at an angle of 45 degrees
• at an angle, usually 60 degrees

A boy looks at the image of an object in a plane mirror. He observes two images, a main bright one and the other faint. The observed images result from

• reflection only

• refraction only

• diffraction and interference

• reflection and infraction

When a plane mirror at which a ray is incident is rotated through an angle, the reflected ray will be rotated through

• half the angle of rotation of the mirror
• the same angle as the rotation of the mirror
• no change in the direction of the ray
• twice the angle of rotation of the mirror

To produce a parallel beam of light from a concave mirror, the distance at which the lamp should be placed from the mirror is equal to

• the focal length

• two times the focal length

• the distance of the image

• two times the radius of curvature

An object is placed in front of two plane mirrors inclined at an angle. If the total number of the images formed is 7, find the value of the angle

• 30 degrees
• 60 degrees
• 90 degrees
• 45 degrees