When light enters a glass prism from air at the first refracting surface, the light ray ____________
Light Refraction at Prism's First Surface
When light travels from air into a glass prism, it moves from one medium to another, causing refraction.
Air is an optically less dense medium compared to glass. Light travels slower when it enters an optically denser medium.
According to the principle of refraction, when a light ray passes from a less dense medium (air) to a denser medium (glass), it bends towards the normal. The normal is a line perpendicular to the surface at the point where the light ray strikes.
- Option 1 is incorrect: Total internal reflection occurs when light moves from a denser to a less dense medium under specific conditions, not the other way around.
- Option 3 is incorrect: Bending away from the normal occurs when light enters a less dense medium.
- Option 4 is incorrect: Light passes straight through without bending only if it is incident normally (at 0 degrees to the normal).
Therefore, the light ray bends towards the normal as it enters the denser medium of the glass prism.
Important Questions from Physics
What special name is given to the frictional force exerted by a fluid?
______ is used in periscope.
Zero degree centigrade is equal to what degree Fahrenheit?
A. 100°F
B. 30°F
C. 34°F
D. 32°F
Keeping voltage constant, if more lamps are put into a series circuit, the overall current in the circuit:
A. Increases
B. Decreases
C. Remains the same
D. Becomes infinite
Excessive curvature of eye lens leads to _______
