class 10 refraction

A student placed a pencil in a cup of water.  The pencil appears broken because light-

• always travels in a straight line
• bends when it passes through water
• makes the water in the glass evaporate
• reflects the pencil on the water's surface

Tags

NGSS.MS-PS4-2

Refraction is the bending of a wave disturbance as it passes from one _________ into another.

• glass
• medium
• area
• boundary

Tags

NGSS.MS-PS4-2

When light passes at an angle to the normal from one material into another material in which its speed is higher 

• it is bent toward the normal.
• it always lies along the normal.
• it is unaffected.
• it is bent away from the normal.

Tags

NGSS.MS-PS4-2

How is light affected by an increase in the index of refraction?

• Its frequency increases
• Its frequency decreases
• Its speed increases
• Its speed decreases

Tags

NGSS.HS-PS4-1

What type of image is formed when rays of light actually intersect?

• real
• virtual
• curved
• projected

Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45

• diamond
• water
• flint glass
• barium glass

Glass has a _____________ index of refraction than air.

• Equal
• Greater
• Less
• Impossible to say

Absolute refractive index of any medium is always _______.

• less than 1
• greater than 1
• 1
• 0

The speed of light in a substance X is 1.25 × 10*8m/s and that in air is 3× 10*8m/s. The refractive index of this substance will be

• 2.4

• 0.4

• 4.2

• 3.75

The refractive index of water with respect to air is 4/3. The refractive index of air with respect to water will be

• 1.75

• 0.50

• 0.75

• 0.25