Refraction and Lenses

Q.

The swimming pool appears to be less deep than it actually is. Which phenomenon is responsible for it?

1. Refraction of light

2. Reflection of light

3. Regular reflection of light

4. Dispersion of light

Q.

Neha visited a dentist in his clinic. She observed that the dentist was holding an instrument fitted with a mirror. State the nature of this mirror and reason for its use in the instrument used by dentist.

Q. Concave lenses are called lenses.

1. diverging
2. converging
3. magnifying

Q.

A light ray moving into air from water will bend towards the normal.

1. True
2. False

Q. Does light have any mass

Q.

Himanshu was challenged by his friend Sushweta to differentiate between a plane, concave and convex mirror without touching them. He placed a candle in front of each of the mirrors and observed that they showed different behaviour. The mirror I always formed a diminished image, mirror II always formed an image of same height while for mirror III the image was enlarged when the candle was placed close to the mirror. Can you help him to identify them?

1. I – Plane mirror, II – Concave mirror, III – Convex mirror

2. I – Concave mirror, II – Plane mirror, III – Convex mirror

3. I – Convex mirror, II – Plane mirror, III – Concave mirror

4. I - Plane Mirror, II - Convex mirror, III - Concave mirror

Q.

Dentists use a ____ mirror to magnify the image of the tooth of a patient.

1. convex

2. concave

3. parabolic convex

4. plane

Q. Light bends towards the normal on travelling from rarer to denser medium.

1. True
2. False

Q. A ray of white light passes from medium 1 to medium 2.
Which of the following quantities of the refracted ray will differ from that of the incident ray?

1. Speed
2. Intensity
3. Frequency
4. Wavelength

Q. The refracted ray of sunlight inside raindrops gets internally reflected before coming out of the raindrop.

1. True
2. False

Q.

The angle of incidence for which refracted ray passes along the boundary separating the two media is called

1. critical angle

2. angle of reflection

3. angle of dispersion

4. angle of refraction

Q.

What do we call the bending of light due to change in medium?

1. Refraction

2. Scattering

3. Absorption

4. Reflection

Q.

Twinkling of stars is due to _____.

1. 'Reflection'

2. 'Dispersion'

3. 'Atmospheric refraction'

4. Diffraction'

Q. The correct diagram to show the refraction of light from air to glass is:

1. 

2. 

3. 

4. 

Q.

A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because:

1. of reflection of light

2. of refraction of light

3. pencil and water react and the direction of light changes

4. glass tumbler creates an illusion and pencil appears displaced

Q. A light ray is travelling from denser to rarer medium. The angle of incidence is equal to the critical angle. Then which of the following statements is/are true?

1. The angle of refraction is 90 degrees.
2. The refracted ray passes along the boundary separating the two medium.
3. The incident ray bounces back to the denser medium.
4. The incident ray passes undeviated from denser medium to rarer medium.

Q. A light ray is travelling from denser to rarer medium. The angle of incidence is equal to the critical angle. Then which of the following statements is/are true?

1. The angle of refraction is 90 degrees.
2. The refracted ray passes along the boundary separating the two medium.
3. The incident ray bounces back to the denser medium.
4. The incident ray passes undeviated from denser medium to rarer medium.