The image formed by a concave mirror is found to be virtual, erect and enlarged. Where should the object be placed?
A ray of light falls on a plane mirror making an angle of 30° with the mirror. On reflection, the ray deviates through an angle of
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The linear magnification produced by concave mirror is always positive. This is because
When two or more than two rays starting from a point on the object, after refraction through a lens, do not actually meet but appear to diverge from point, the image formed is
A concave mirror produces an image of 20 cm height which is five times magnified. The height of the object is
The linear magnification of a convex mirror of focal length 15 cm is 1/3. The distance of the object from the mirror is
The power of a convex lens P1 is equal to 4 D, which is placed in close contact with a concave lens having power P2 equal to – 10 D. What will be the power of the combination of the two lenses?
The image of a small electric bulb fixed on the wall of a room is to be obtained, on the opposite wall 3 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?
The linear magnification of a convex lens is – 1 when object in front of the lens is
If a glass is placed in a liquid of refractive index that is equal to glass, it will