Question
The diagram shows the image of a clock in a plane mirror.
Which is the actual time?
A $04: 15$
B $04: 45$
C $07: 15$
D $07: 45$
Answer/Explanation
Ans:C
Question
Which statement about the image of an object formed in a plane mirror is correct?
It is smaller than the object.
It is the same size as the object.
It is larger than the object.
It is inverted.
Answer/Explanation
Ans: B
Question
The wavelength of blue light changes from 4.7 × 10-7 m to 3.5 × 10–7 m as it passes from air to water.
What is the speed of this light in water?
A 7.4 ×107 m/s
B 1.3 × 108 m/s
C 2.2 × 108 m/s
D 3.0 ×108 m/s
Answer/Explanation
Ans: CQuestion
The wavelength of blue light changes from 4.7 × 10-7 m to 3.5 × 10–7 m as it passes from air to water.
What is the speed of this light in water?
A 7.4 ×107 m/s
B 1.3 × 108 m/s
C 2.2 × 108 m/s
D 3.0 ×108 m/s
Answer/Explanation
Ans: CQuestion
Which statement is correct?
The speed of light in glass is equal to the speed of light in a vacuum multiplied by the refractive index of glass.
The incident angle of a light ray at an air-glass surface is the angle between the ray and the glass surface.
The sine of the critical angle at an air-glass surface is equal to 1/refractive index of glass
The angle of refraction for light passing through an air-glass surface is proportional to the angle of incidence at that surface.
Answer/Explanation
Ans: C