Monthly Quiz October 2023, G9

The mirror which always gives virtual, erect image at the same distance as the object is .....................

• Convex mirror

• Concave mirror

• Plane mirror

• Spherical mirror

This lens is ................................

• Converging lens

• Convex lens

• Plane lens

• Diverging lens

The point (O) represents ..........................

• The focus

• The center of curvature

• The lens diameter

• The optical center

In Short- sightedness the convexity of the eye lens ......................, So, we can correct vision by using ......................... lens

• Increases, Concave

• Increases, Convex

• decreases, Convex

• decreases, Concave

An object at 10 cm height is put in the front of concave mirror with focal length of 5 cm.

A virtual magnified erect image is formed.

So the distance between the object and the mirror is ........................

• 10 cm

• 7 cm

• 5 cm

• 3 cm

In the opposite figure, the angle of reflection equal ...................

• 30^o

• 50^o

• 40^o

• 60^o

An object of 10 cm height is put on the front of convex lens, its focal length is 5 cm

the formed image was 10 cm height and inverted.

So, the distance between the object and the lens is ...................................

• 3 cm

• 5 cm

• 7 cm

• 10 cm

The light ray which passes the optical center of the lens

• Reflect on itself

• passes without refraction

• Reflects parallel to the focus

• Refract parallel to the principle axis

When the formed image can't be received on a screen. So, it is .........................

• Erict

• Diminshed

• inverted

• vertual

The straight line between the center of curvature of the concave mirror and any point on the reflecting surface is the .....................................

• Secondary axis

• Principle axis

• Focal length

• Radius of the mirror