A lens having power 8 D is kept in contact with another lens having power -4 D. The lens combination will act as a?

An object is placed on the principal axis of a convex lens of focal length 12 cm, at a distance magnification produced by the lens is ______and the image is_______?

An object. 3.0 cm in height, is placed at a distance of 20.0 cm in front of a convex mirror of focal length 6.0 cm. on its principal axis. Its image has a height of _______and is_____?

A convex lens forms a real and inverted image twice the size of the object. The magnification produced by the lens is equal to?

A convex lens produces a magnification of-3 for an object placed at 1.5 m from the leas. Find the image distance (with correct sign).

The magnification 'm' produced by a convex lens when the object is placed at a distance 2f from the lens is given by?

The unit of focal power of lense is :

The image of an object formed on the retina of human eye is:

Power of a lens is 10 D, its focal length is :

ലെൻസിന്റെ പവർ അളക്കുന്ന യൂണിറ്റ് :

______ mirror is used in motor vehicles as rear view mirror.