Light – Reflection and Refraction

A concave lens always forms an image that is:

1. Real and inverted
2. Virtual and erect
3. Real and enlarged
4. Inverted and enlarged

The centre of curvature of a spherical mirror is represented by:

1. C
2. F
3. P
4. O

Which phenomenon causes a pencil partly immersed in water to appear bent?

1. Reflection
2. Dispersion
3. Refraction
4. Scattering

The image formed by a convex lens when the object is placed beyond 2F is:

1. Virtual and enlarged
2. Real, inverted and diminished
3. Virtual and erect
4. Real and enlarged

The splitting of white light into its seven colours is called:

1. Reflection
2. Refraction
3. Dispersion
4. Scattering

The mirror formula is:

1. 1/f = 1/v + 1/u
2. f = u + v
3. v = f × u
4. f = uv

When light travels from air into glass, it bends:

1. Away from the normal
2. Towards the normal
3. Along the surface
4. Does not bend

The SI unit of power of a lens is:

1. Metre
2. Dioptre
3. Watt
4. Newton

A lens thicker at the centre and thinner at the edges is called:

1. Concave lens
2. Convex lens
3. Plane lens
4. Cylindrical lens

The refractive index of a medium depends on:

1. Speed of light in vacuum only
2. Speed of light in the medium only
3. Ratio of speed of light in vacuum to speed in medium
4. Density only

Which mirror is used as a rear-view mirror in vehicles?

1. Concave mirror
2. Convex mirror
3. Plane mirror
4. Parabolic mirror

The focal length of a plane mirror is:

1. Zero
2. Infinite
3. Equal to radius of curvature
4. Negative

Which mirror is used by dentists to see enlarged images of teeth?

1. Plane mirror
2. Convex mirror
3. Concave mirror
4. Cylindrical mirror

The angle of incidence is equal to the angle of reflection. This law is known as:

1. Law of refraction
2. First law of reflection
3. Second law of reflection
4. Law of dispersion

Why does a convex lens converge parallel rays of light?

1. Because it reflects light
2. Because it absorbs light
3. Because refraction causes rays to bend toward the principal axis
4. Because it scatters light

The relationship between focal length (f) and radius of curvature (R) for a spherical mirror is:

1. f = R
2. f = 2R
3. f = R/2
4. f = R/4

Which lens is used to correct myopia (short-sightedness)?

1. Convex lens
2. Concave lens
3. Bifocal lens
4. Cylindrical lens

What is the SI unit of power of a lens?

1. Meter
2. Joule
3. Dioptre
4. Newton

Which lens is thicker at the center and thinner at the edges?

1. Concave lens
2. Convex lens
3. Cylindrical lens
4. Plane lens

What is refraction of light?

1. Reflection of light from a mirror
2. Splitting of light into colors
3. Bending of light when it passes from one medium to another
4. Absorption of light

Which mirror can produce both real and virtual images?

1. Convex mirror
2. Plane mirror
3. Concave mirror
4. None of these

What is the focal length of a spherical mirror?

1. Distance between pole and center of curvature
2. Distance between focus and center of curvature
3. Distance between pole and principal focus
4. Distance between object and image

According to the law of reflection, the angle of incidence is always equal to:

1. Angle of refraction
2. Angle of deviation
3. Angle of reflection
4. Angle of dispersion

Which type of mirror is commonly used as a rear-view mirror in vehicles?

1. Plane mirror
2. Convex mirror
3. Concave mirror
4. Spherical mirror

Which planet is known as the Red Planet?

1. Earth
2. Mars
3. Jupiter
4. Venus