1.
The image which is formed behind the mirror
2.
Convex lens is also known as
3.
The deviation of light ray from its path when its travels from one transparent medium to another transparent medium is called
4.
The mirror used as rear-view mirror in vehicles
5.
The mirror having reflection surface curved outward
6.
A student obtains a sharp image of the distant window(w) of the school laboratory on the screen (s) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
7.
A student used a device (X) to obtain /focus the image of a well illuminated distant building on a screen (S). Select the correct statement about the device(x)
8.
Light travels fastest in
9.
In which of the following the image of an object placed at infinity will be highly diminished and point sized?
10.
A child is standing in front of magic mirror. She finds the image of her head is bigger, the middle portion of her body is of same sized the lower portion is smaller. The sequence of mirrors is
11.
You are given water (1.33), mustard oil (1.47), glycerine (1.473) and kerosene (1.44). In which of these media a ray of light incident obliquely at same angle would bend the most?
12.
The laws of reflection hold good for
13.
In torches, search lights and headlights of vehicles the bulb is placed
14.
A full length of a distant tall building can definitely be seen by using
15.
Rays from sun converge at a point 15 cm in front of a concave mirror. where should an object be placed so that size of its image is equal to the size of the object?
16.
Magnification produced by a rear view mirror fitted in vehicles
17.
Which of the following statements a is true?
18.
Under which of the following conditions a concave mirror can form an image larger than the actual object
19.
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of mirror. The focal length of this mirror is
20.
Which of the following can make a parallel beam of light when light from a point source is incident on it?
21.
Focal length of plane mirror is
22.
A candle placed in front of a concave mirror at a distance of 30 cm. If real image is obtained on a screen 15 cm away from the mirror, the magnification is
23.
A virtual, erect and magnified image of an object is to produce with a concave mirror of focal length 12 cm. object may be placed at a distance of
24.
The image of an object placed in front of a convex mirror is formed at
25.
An object is placed 30 cm in front of convex lens. The virtual image formed by the lens is located 60 cm behind the lens. What is the magnification produced by the lens?
26.
A concave mirror is made by cutting a portion of a hollow glass sphere of radius 24cm, find the focal length of the mirror
27.
What is the distance between a real object and its real image in the case of a concave mirror, when the object is placed at the centre of curvature?
28.
A ray of light travelling in air goes into water. The angle of refraction will be
29.
The refractive indices of four substances P, Q, R and S are 1.50,1.36,1.77,1.31 respectively. The speed of light is maximum in the substance
30.
The refractive index of glass for light going from air to glass is 3/2. The refractive index for light going from glass to air will be
31.
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces
32.
A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose, the object should be placed
33.
A convex lens produced a magnification of +5. The object is placed at
34.
A spherical mirror and a spherical lens each have a focal length of -15 cm. the mirror and the lens are likely to be
35.
Magnification produced by a concave lens is always
36.
A diverging lens is used in
37.
Which of the following can form a virtual image which is always smaller than the project?
38.
The focal length of four convex lenses P, Q, R and S are 20cm, 15 cm, 5 cm, and 10 cm respectively. the lens having greatest power is
39.
A light ray enters from medium A to medium B as shown in figure. The refractive index of
medium B relative to A will be
40.
The diagrams showing the correct path of the ray after passing through the
41.
Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. which of the following could be inside the box?
42.
Different colours of light have same velocity in vacuum but they have different velocities in any other transparent medium if the RI is different
43.
If the refractive index of one medium is equal to refractive index of second medium, then the beam of light does not bend at all.
44.
Which one is the correct diagram?
45.
The unit of power of lens is
46.
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?
47.
Speed of light in a vacuum is represented by
48.
Which can change during refraction of light?
49.
The power is related to the thickness of the lens
50.
Which one is correct?
