LIGHT CLASS 10TH TEST

which of the following quantity remain constant during the reflection of light ?

• Amplitude

• Wavelength

• Velocity

• Phase

The image formed by the concave mirror, which is focused the tree located at infinite distance is -----'

• At C

• At F

• At 2C

• At 2F

In which of the following condition concave mirror forms a virtual image ?

• When an object is placed at C

• When an object is placed at F

• When an object is placed at 2C

• When an object is placed in between F and P

The angle of incidence of a ray of light passing through the centre of curvature of a concave mirror is ........... degree

• 105

• 180

• 90

• 0

Name the type of mirrors used in the following situations:

(i) Used by Dentist.

(ii) Rear-view mirror of vehicle

• (i) Diverging mirror

  (ii) Converging mirror

• (i) & (ii) Both Converging mirror

• (i) Converging mirror

  (ii) Diverging mirror

• (i) & (ii) Both Diverging mirror.

An object is kept at a distance of 4m in front of a spherical mirror, which forms its erect image at a distance of 1m

from the mirror. What is the magnification? Is the mirror concave or convex?

• m = +4

  Concave Mirror

• m = -4

  Convex mirror

• m = - 1/4

  Convex Mirror

• m = +1/4

  Convex Mirror

A concave mirror produces a three times magnified image on a screen. If the object is placed 20cm in front of the mirror, What is the image distance?

• -20 cm

• -40cm

• -60 cm

• -10 cm

The image of a candle flame placed at a distance of 30cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60cm from its pole. What is the nature of the mirror? Find its focal length.

• F = - 20 cm

  Concave Mirror

  Real & Inverted Image

• F = + 20 cm

  Concave Mirror

  Virtual & Erect Image

• F = - 20 cm

  Convex Mirror

  Real & Inverted Image

• F = + 20 cm

  Convex Mirror

  Virtual & Erect Image

An object 5 cm in size is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 40 cm. Find out the position, size and nature of the image formed.

• v = + 10 cm

  h' = + 2.5 cm

  Virtual, Erect and smaller in size.

• v = - 20 cm

  h' = - 0.5 cm

  Real, Inverted and enlarge in size.

• v = + 20 cm

  h' = + 0.5 cm

  Real, Inverted and enlarge in size.

• v = - 10 cm

  h' = - 2.5 cm

  Virtual, Erect and smaller in size.

According to laws of reflection,

• angle of incidence > angle of reflection

• angle of incidence < angle of reflection

• angle of incidence = angle of reflection

• both 1 and 2