Click the correct answer (True or False).
Click the correct answer.
What is the speed of light in water if the refractive index of water with respect to air is 4/3?
3 × 108 m s-1
2.25 × 108 m s-1
1.8 × 108 m s-1
1. 5 × 108 m s-1
Which of the following relation is correct according to the Snell’s law?
sin i/sin r = μ
sin r/sin i = μ
sin r – sin i = μ
sin r + sin i = μ
What is the phenomenon in which light passing through a prism splits into its constituent colours called?
Diversion
Dissection
Dispersion
Dissolution
Click the correct answer.
When a ray of light moves from an optically denser medium to an optically rarer medium
.
it bends towards the normal
it bends away from the normal
it goes undeviated through the second medium
its path is independent of the medium
The focal length of a concave mirror is 20 cm. If an object is placed at a distance of 40 cm from the pole, then its image will be formed
.
at 20 cm and will be erect in nature
at 40 cm and will be inverted in nature
at 40 cm and will be erect in nature
at 20 cm and will be inverted in nature
If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed
.
at focus
between pole and focus
beyond centre of curvature
at centre of curvature
Convex mirrors are used in
.
searchlights
vigilance mirrors
shaving mirrors
reflecting type telescopes
A ray of light travelling from an optically rarer medium to a denser medium
.
bends towards the normal
bends away from the normal
remains undeviated
its path is independent of the medium
A ray incident on a spherical mirror retraces its path after reflection. The point on the mirror from where the ray retraces its path is
.
pole
focus
centre of curvature
between focus and pole
The image formed by a convex mirror is always
.
virtual and erect
real and inverted
virtual and inverted
real and erect
The focal length of a concave mirror is 15 cm. If an object is placed at a distance of 30 cm from the pole, then its image will be formed
.
at 15 cm and will be erect in nature
at 30 cm and will be inverted in nature
at 30 cm and will be erect in nature
at 20 cm and will be inverted in nature
