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An object is placed on the principal axis of a spherical mirror. The object distance u is:
Power of a lens is
If the magnification has a positive sign, the image formed by the concave mirror must be
The image formed by a convex lens is virtual when
Whenever light goes from one medium to another, the characteristic that does not change is:
A simple magnifying glass consists of:
The size of the image formed by the convex mirror is
Which lens always forms a virtual image?
Light travels faster in substance X as compared to substance Y, then refractive index is greater for
Where should an object be placed in front of convex lens so as to obtain the image formed on slide projector?
Which kind of a mirror is used to see the enlarged image of the object?
When the image is of the same size as the object, the magnification is
The focal length of a plane mirror is
is the lateral inversion of
An observer moves towards a stationary plane mirror at a speed of 4m/s. The speed of image with respect to mirror is __________.
A ray of light incident on the optical centre of a spherical lens, after refraction passes through:
The concave mirrors are used in
The magnification of a convex mirror is always:
The mirror formula is valid for
When a mirror is rotated through an angle θ, the reflected ray from it turns through an angle of
Which one of the following is the use of concave lens
If the speed of light in medium 1 and medium 2 are 2.5 x 108 m/s and 2 x 108m/s respectively then the refractive index of medium 1 with respect to medium 2 is ___________
Light changes its path as the medium changes during the transit. This is because of
A spherical mirror and a thin spherical lens have each a focal length of -12 cm. The mirror and the lens are likely to be: