Grade 8th Physics: Light

What type of mirror is this?

• Convex mirror

• Concave mirror

• Crescent mirror

What is the center of curvature in a convex mirror?

• 3C

• 2F

• 2P

• 3P

Radius of a spherical mirror is ____ it’s focal length

• four times

• Thrice

• Six times

• Twice

The ________ at the point of incidence is called the normal.

• Perpendicular

• Vertical

• Parallel

• Horizontal

When two mirrors are kept parallel to each other the number of images is _____________.

• 34,56,72,12,4,51

• 5

• Limited

• Infinite

What is the cause of refraction?

• Refraction is caused by the change of speed of light when it goes from country to 5 others

• Refraction is caused by the change of speed of light when it passes from one medium to another.

• Refraction is caused by the change of speed of light when it jumps to light speed

• Refraction is caused by the change of speed of light when it jumps to 5 universes

What are the differences between reflection and refraction of light?

• There is no difference

• When light ray strike on opaque surface and rebound into the same medium, reflection occurs While Refraction occurs when a ray of light passes from one transparent to another having different densities.

• When light ray strike on transparent surface and rebound into the different medium, reflection occurs. While Refraction occurs when a ray of light passes from one transparent to another having different densities.

The splitting of light into its component colours is termed as:

• Refraction

• Spectrum

• Diffraction

• Dispersion

If the angle of incident is 30° , what will be the angle of reflection from plane mirror

• 30

• 90

• 60

• 0

Image formed by the plane mirror is:

• Always real

• Always virtual

• Sometimes real sometimes virtual

• None of the above