Reflection and Refraction of Light

The velocity of light in vacuum is _______ m/s

• 3x10⁸
• 3x10¹²
• 3x10⁶
• 3x10¹⁰

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

We can see objects because of_______

• reflection
• refraction
• transmission
• diffraction

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NGSS.MS-PS4-2

How does light behave as it enters these mediums?

• continue its path as straight line.
• bends toward the normal
• bends away from the normal
• reflects

Absolute refractive index of any medium is always _______.

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

According to the Law of reflection, a light ray striking a mirror

• continues moving through the mirror in the same direction
• moves into the mirror at a slightly different angle
• bounces off the mirror toward the direction it came from
• bounces off the mirror at the same angle it hits.

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NGSS.MS-PS4-2

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

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

• glass
• medium
• area
• boundary

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.

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NGSS.HS-PS4-5

The angle of incident for a ray of light having zero reflection angle is

• 0 degree

• 30 degree

• 45 degree

• 90 degree

Which of the following mirror is used by a dentist to examine a small cavity ?

• convex mirror

• plane mirror

• concave mirror

• combination of convex and concave mirror