Dakshana Mock Test Season II

Dakshana Mock Test Season II

1] The number of images formed by two plane mirrors inclined at 45° of an object placed symmetrically between mirror is

i. 6
ii. 7
iii. 5
iv. Infinite

2] A ray of light is incident on a plane mirror at an angle of incidence of 30°.The deviation produced by the mirror is

i. 30°
ii. 60°
iii. 90°
iv. 120°

3] There are two plane mirrors M1 and M2 kept at a distance of 10 cm from each other and an object O is placed between them such that it is 8cm away from M1 and 2cm away from M2. What will be the distance of the first 3 images from the mirror M2?

i. 2cm, 8cm, 14cm
ii. 2cm, 12cm, 18cm
iii. 2cm, 18cm, 22cm
iv. 2cm, 24cm, 38cm

4] A point object is placed midway between two plane mirrors a distance apart. The plane mirrors form an infinite number of images due to multiple reflections. Then the distance between nth order of images formed in the two mirrors is

i. na
ii. 2na
iii. 0.5na
iv. n2a

5] An observer moves towards a plane mirror with a speed of 2m/s, the speed of the image with respect to the observer is

i. 1m/s
ii. 2m/s
iii. 4m/s
iv. 8m/s

6] Passenger side rear view mirror used in car are

i. Plane mirrors
ii. Concave mirrors
iii. Convex mirrors
iv. None of these

7] Image formed by a plane mirror is

i. Virtual
ii. Erect
iii. Same size as that of object
iv. All of the above

8] A beam of light passes from medium 1 to medium 2 to medium 3 as shown in the figure. What may be concluded about the three indices of reflection n1, n2, n3?


i. n3 > n1 > n2
ii. n1 > n3 > n2
iii. n2 > n3 > n1
iv. n2 > n1 > n3

9] Two plane mirrors are inclined at an angle of 60°. How many images will be formed of an object kept between them.

i. 3
ii. 4
iii. 5
iv. 6

10] Light of wavelength 500 nm traveling with a speed of 2.0*108ms-1 in certain medium enters another medium. What is the wavelength and speed of the given light in the second medium ?

i. Wavelength = 400nm; Speed = 1.6*108
ii. Wavelength = 400nm; Speed = 2.5*108
iii. Wavelength = 500nm; Speed = 2.5*108
iv. Wavelength = 625nm; Speed = 1.6*108

11] A concave mirror forms a real image on screen which is thrice the linear dimension of object. Object and screen moved until image became twice of size of object. If the object is shifted 6cm, find the focal length of the mirror.

i. 12cm
ii. 24cm
iii. 36cm
iv. 48cm

12] A object is placed at a distance x from the focus of a concave mirror, and the real image is formed at a distance y from the focus. The focal length of the mirror is

i. xy
ii. √(xy)
iii. x+y
iv. √(x/y)

13] An object is placed in front of a convex mirror of focal length 50cm. If the image is one-fourth the size of the object, the distance of the image from the mirror is

i. 25cm
ii. 37.5cm
iii. 50cm
iv. 75cm

14] A concave mirror of focal length f produces a real image n times the size of the object. The distance of the object from the mirror is

i. (n-1)f
ii. (n+1)f
iii. f(n+1)/n
iv. f(n-1)/n

15] A convex mirror is used to form an image of a real object, so the image

a. always lies between the pole and the focus
b. is diminished in size
c. is erect
d. is real

i. a, b
ii. b, c
iii. c, d
iv. a, b, c

16] A convex lens of power +5D is placed in contact with a concave lens of power -4D. What is the nature and focal length of the combination?

i. Concave, 25cm
ii. Convex, 50cm
iii. Concave, 20cm
iv. Convex, 100cm

17] The image of an object, kept in front of a convex mirror is formed _____.

i. at position of object
ii. at double distance of position of object
iii. at half distance of position of object
iv. behind the mirror

18] The focal length of plane mirror is:

i. Zero
ii. Infinite
iii. -25cm
iv. 25cm

19] The object is placed at a distance of 5cm in front of a plane mirror. The distance of image from mirror will be:

i. 5cm
ii. 10cm
iii. 20cm
iv. 0cm

20] If refractive index of glass with respect to air is 1.5, then the refractive index of air with respect to glass will be

i. 1:1.5
ii. 1:5
iii. 3:1
iv. 1.5:1

21] Focal length of a convex mirror is 10cm. The radius of convex surface will be:

i. 5cm
ii. 20cm
iii. 15cm
iv. 24cm

22] If angle of incidence is 40° and angle of refraction is 30°, then refracted ray is deviated by an angle

i. 10°
ii. 70°
iii. 1.4°
iv. sin40°/sin30°

23] Speed of the light in air is 3*108m/s. The speed of the light in water(refractive index 4/3) will be

i. 2.25*108m/s
ii. 4*108m/s
iii. 2*108m/s
iv. 2.55*108m/s

24] If the incident ray and emergent ray in the glass slab in figure are parallel then


i. µ1 > µ2
ii. None of these
iii. Both (i) and (iv)
iv. µ1 = µ3

25] If a ray incident normally on a reflecting surface then angle of reflection will be:

i. 90°
ii. 0°
iii. 45°
iv. 30°







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