Ray Optics Test

Result

Ray Optics Test - 102

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Question 1
4 / -1

If an object moves towards a plane mirror with a speed v at an angle θ to the perpendicular to the plane of the mirror, find the relative velocity between the object and the image

A
v

B
2v

C
2v cos θ

D
2v sin θ

Solution
Question 2
4 / -1

A plane mirror is placed at the bottom of the tank containing a liquid of refractive index μ. P is a smallobject at a height h above the mirror. An observer O–vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be

A

B

C

D

Solution
Question 3
4 / -1

One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence i = 45°. Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is

A
90°

B
180°

C
120°

D
45°

Solution
Question 4
4 / -1

A
15 cm

B
12.5 cm

C
7.5 cm

D
10 cm

Solution
Question 5
4 / -1

In an experiment to determine the focal length (f)of a concave mirror by the u – v method, a student places the object pin A on the principal axis at a distance x from the pole P. The student looks at the pin and its inverted image from a distance keeping his/her eye in line with PA . When the student shifts his/her eye towards left, the image appears to the right of the object pin. Then

A
x

B
f< x<2f

C
x = 2f

D
x > 2f
Question 6
4 / -1

Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1 : 2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is

A
1.1

B
1.2

C
1.3

D
1.4

Solution
Question 7
4 / -1

An object is placed infront of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and plane mirror is 30 cm, it is found that there is no parallax between the images formed by two mirrors. Radius of curvature of mirror will be

A
12.5 cm

B
25 cm

C
50/3 cm

D
18 cm

Solution
Question 8
4 / -1

A cube of side 2 m is placed in front of a concave mirror focal length 1 m with its face P at a distance of 3 m and face Q at a distance of 5 m from the mirror. The distance between the images of face P and Q and height of images of P and Q are

A
1 m, 0.5 m, 0.25 m

B
0.5 m, 1 m, 0.25 m

C
0.5 m, 0.25 m, 1 m

D
0.25 m, 1 m, 0.5 m

Solution
Question 9
4 / -1

A small piece of wire bent into an L shape with upright and horizontal portions of equal lengths, is placed with the horizontal portion along the axis of the concave mirror whose radius of curvature is 10 cm. If the bend is 20 cm from the pole of the mirror, then the ratio of the lengths of the images of the upright and horizontal portions of the wire is

A
1 : 2

B
3 : 1

C
1 : 3

D
2 : 1

Solution
Question 10
4 / -1

The image of point P when viewed from top of the slabs will be

A
2.0 cm above P

B
1.5 cm above P

C
2.0 cm below P

D
1 cm above P

Solution