Dakshana Mock Test Season II Solutions
Dakshana Mock Test Season II Solutions
1] The number of images formed by two plane mirrors inclined at 45° of an object placed symmetrically between mirror is
Answer: 7
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
Answer: 120°
3] Figure is below shows two plane mirrors and an object O placed between them. What will be distance of the first 3 images from the mirror M2
Answer: 2cm, 18cm, 22cm.
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
Answer: 2na
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
Answer: 4m/s.
6] Passenger side rear view mirror used in car are
Answer: Convex mirrors.
7] Image formed by a plane mirror is
Answer: 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?
Answer: n2 > n1 > n3.
9] Two plane mirrors are inclined at an angle of 60° as shown in the figure. How many images will be formed of an object kept at O.
Answer: 5
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 ?
Answer: Wavelength = 400nm; 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.
Answer: 36cm
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
Answer: √(xy)
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
Answer: 37.5cm
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
Answer: 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
Answer: 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?
Answer: Convex, 100cm
17] The image of an object, kept in front of a convex mirror is formed _____.
Answer: behind the mirror.
18] The focal length of plane mirror is:
Answer: Infinite.
19] The object is placed at a distance of 5cm in front of a plane mirror. The distance of image from mirror will be:
Answer: 5cm
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
Answer: 1:1.5
21] Focal length of a convex mirror is 10cm. The radius of convex surface will be:
Answer: 20cm
22] If angle of incidence is 40° and angle of refraction is 30°, then refracted ray is deviated by an angle
Answer: 10°
23] Speed of the light in air is 3*108m/s. The speed of the light in water(refractive index 4/3) will be
Answer: 2.25*108m/s
24] If the incident ray and emergent ray in glass slab are parallel then
Answer: µ1 = µ3
25] If a ray incident normally on a reflecting surface then angle of reflection will be:
Answer: 0°
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