Question

ser medium, the speed of light is
H of light in vacuum.
ent ray always bends away from
asses from one transparent​

Answer 1

Answer:

(a) The speed of light in air or vacuum is

1. 3 × 108 M s-1

2. 2.25 × 108 m s-1

3. 332 ms-1

4. 2.0 × 108 ms-1

(b) A ray of light moving from an optically rarer to a denser medium

1. bends away from the normal

2. bends towards the normal

3. remains undeviated

4. none of the above

(c) The angle between the normal and refracted ray is called

1. angle of deviation

2. angle of incidence

3. angle of refraction

4. angle of emergence.

(d) The property of splitting of white light into its seven constituent colours is known as

1. rectilinear propagation

2. refraction

3. reflection

4. dispersion

(e) The seven colours in the spectrum of sunlight in order, are represented as :

3. becomes parallel to the principal axis

4. retraces its own path.

(g) If the radius of curvature of a concave mirror is 20 cm, its focal length is:

1. 10 cm

2. 20 m

3. 40 cm

4. 80 cm

(h) The image formed by a convex mirror is

1. erect and diminished

2. erect and enlarged

3. inverted and diminished

4. inverted and enlarged

1. VIBGYOR

2. VIGYBOR

3. BIVGYOR

4. RYOBIVG

(f) A ray of light passing through centre of curvature of a spherical mirror, after reflection

1. passes through the focus

2. passes through the pole