1.
A convex lens forms a real image of an object placed beyond 2F. The image is
2.
The refractive index of glass is 1.5. The speed of light in glass is approximately
3.
The image formed by the eyepiece of a microscope is
4.
A telescope is mainly used to observe
5.
Which optical instrument provides the highest magnification?
6.
A ray of light is incident normally on a glass slab. The angle of refraction is
7.
The focal length of a convex lens is 20 cm. An object is placed at 40 cm. The image is formed at
8.
A ray passing through the principal focus of a convex lens emerges
9.
The critical angle for glass-air interface is about
10.
The image formed by a convex mirror is always
11.
A person suffering from hypermetropia is corrected using
12.
Which optical instrument gives an erect magnified image?
13.
The near point of a normal human eye is
14.
Optical fibres work on the principle of
15.
The objective lens of an astronomical telescope should have
16.
The image formed by a compound microscope is finally
17.
Which of the following quantities remains unchanged when light passes from air to glass?
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