Questions

Regular reflection takes place on a polished surface.
True
Flase
 Virtual, upright (erect), and diminished images are always formed with convex
mirrors, irrespective of the distance between the object and the mirror. ( √ )
The image formed by the concave mirror can be small or large and can be real or
virtual. ( √ )
 In concave mirror, if we increase the distance between the object and the mirror then
the size of the image reduces ( √ )
√
√
√
√
Which statement is true for the reflection of light?
(a) The angle of incidence and reflection are equal. √
(b) The reflected light is less bright than the incident light.
(c) The sum of the angle of incidence and reflection is always greater than 900.
(d) The beams of the incident light, after reflection, diverge at unequal angles.
Correct Answer: Option (a)
5) The image shows the path of incident rays to a concave mirror.
Where would the reflected rays meet for the image formation to take place?
(a) Behind the mirror
(b) Between F and O
(c) Between C and F
√
(d) Beyond C
Correct Answer: Option (c)
An object is placed at a distance of 40cm in front of a concave mirror of a focal length

of 20 cm.
The image produced is:
(a) virtual and inverted
(b) real and erect
(c) real, inverted and of the opposite size as that of the object
(d) real, inverted and of the same size as that of the object
√
Correct Answer: Option (d)
Q10) Image formed by a convex spherical mirror is:

(a) virtual √
(b) real
(c) enlarged
(d) inverted
Correct Answer: Option (a)
Q16) The image of an object placed in front of a convex mirror is formed at
(a) the object itself
(b) twice the distance of the object in front of the mirror
(c) half the distance of the object in front of the mirror
(d) behind the mirror √
Correct Answer: Option (d)
1. The diagram shows a ray of light being reflected by a plane

mirror.
The angle of reflection is:
A. ? 55o
B. ? 35o
C. ? 20o
D. ? 70o
E. ? 110o
Diffuse reflection would most likely occur from a _____.

a. Carpet
√
b. mirror
c. glass tabletop
d. calm lake
e. sunglasses lens
A concave mirror gives real, inverted and same size image if the object is
placed
a. At F
b. At infinity
c. At C
d. Beyond C
The velocity of light in air is 3 × 108 m/s. Find the velocity of light in glass of
refractive index 1.5. If the wavelength of yellow light in air is 6000Å, find its
wavelength in the glass.
Solution
Let v1 and v2 be the velocities of light in air and glass respectively.
Using the definition of refractive index.
n1 of air=1 n2 for glass
n2/n1 = v1/v2
v2 = 3 x 108/1.5 = 2 x 108 m/s
Since frequency remains same when light passes from one medium to another.
n2/n1 = λ1/λ2
or λ2 = λ1/μ =6000/1.5 = 4000Å

A source emits monochromatic light of wavelength 495 nm in air. When the light passes
through a liquid, its wavelength reduces to 434 nm. What is the liquid’s index of
refraction?
(a) 1.26 (b) 1.49 (c) 1.14 (d) 1.33 (e) 2.03
Hint
2n2 =air n air
light wave moves between medium 1 and medium 2. Which of the following are correct
statements relating its speed, frequency, and wavelength in the two media, the indices of
refraction of the media, and the angles of incidence and refraction? More than one
statement may be correct.
(a) v1/sin 1 = v2/sin 2

(b) csc 1/n1 = csc 2/n2
(c) 1/sin 1 = 2/sin 2
(d) f1/sin 1 = f2/sin 2
(e) n1/cos 1 = n2/cos 2
Solution:
Light can travel from air into water. Some possible paths for the light ray in the water
are shown in Figure OQ35.7. Which path will the light most likely follow?
(a) A (b) B (c) C (d) D (e) E
Light traveling in a medium of index of refraction n1is incident on another medium

having an index ofrefraction n2. Under which of the following conditionscan total
internal reflection occur at the interface ofthe two media?
(a) The indices of refraction have the relation n2> n1.
(b) The indices of refraction have the relation n1 > n2.
(c) Light travels slower in the second medium than in the first.
(d) The angle of incidence is less than the critical angle.
(e) The angle of incidence must equal the angle of refraction.

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Regular reflection takes place on a polished surface.

5) The image shows the path of incident rays to a concave mirror.

An object is placed at a distance of 40cm in front of a concave mirror of a focal length

Q10) Image formed by a convex spherical mirror is:

1. The diagram shows a ray of light being reflected by a plane

The angle of reflection is:

Diffuse reflection would most likely occur from a _____.

Let v1 and v2 be the velocities of light in air and glass respectively.

Using the definition of refractive index.

n1 of air=1 n2 for glass

v2 = 3 x 108/1.5 = 2 x 108 m/s

or λ2 = λ1/μ =6000/1.5 = 4000Å

(a) v1/sin 1 = v2/sin 2

Light traveling in a medium of index of refraction n1is incident on another medium

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