science
Grade-7
Easy
Question
A light ray traveling through air (n = 1) enters the kerosene (n = 1.44) floating on top of water (1.33) in a glass (n = 1.5) container. It bends ___ the normal at the air-kerosene interface, ___ the normal at the kerosene-water interface and ___ the normal at the water-glass interface.
- Towards, away from, towards
- Away from, towards, towards
- Towards, towards, away from
- Away from, away from, towards
Hint:
- When a ray of light passes from a rarer to denser medium it bends towards the normal.
- When light travels from a denser medium to a rarer medium, it bends away from the normal.
- When a ray of light passes from a rarer to denser medium it bends towards the normal.
- When light travels from a denser medium to a rarer medium, it bends away from the normal.
The correct answer is: Towards, away from, towards
- When a ray of light passes from a rarer to denser medium it bends towards the normal.
- When light travels from a denser medium to a rarer medium, it bends away from the normal.
- At air-kerosene interface, air is rarer and kerosene is denser because refractive index of kerosene is greater than air so it bends towards the normal.
- At kerosene-water interface, kerosene is denser and water is rarer so light is going from denser to rarer hence it bends away from the normal.
- At Water-glass interface water is rarer and glass is denser so it will bends towards the normal.
- So Towards, away, towards.
- When a ray of light passes from a rarer to denser medium it bends towards the normal.
- When light travels from a denser medium to a rarer medium, it bends away from the normal.
- At air-kerosene interface, air is rarer and kerosene is denser because refractive index of kerosene is greater than air so it bends towards the normal.
- At kerosene-water interface, kerosene is denser and water is rarer so light is going from denser to rarer hence it bends away from the normal.
- At Water-glass interface water is rarer and glass is denser so it will bends towards the normal.
- So Towards, away, towards.
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