Convex Lens

A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal?

• Towards

• Away

A ray of light through the--------- of a lens passes without suffering any deviation.

• optical centre

• focus

• centre of curvature

• aperture

For a convex lens, if tho object is at infinity--------, the image is -----

• Between F2 and 2F2

• At 2F2

• At focus F2

• Beyond 2F2

At which position should an object be placed infront of a convex lens so that the image is virtual and erect?

• At F1

• Between focus F1 and O

• At 2F1

• beyond 2 F1

At which position should an object be placed infront of a convex lens so as to obtain an image of the same size as that of object?

• At F1

• At 2F1

• Beyond 2F1

• Between F1 and 2F1

Power of a convex lens is ------- and that of a concave lens is -------------.

• positive, negative

• negative, positive

The SI unit of power of a lens is--------

• metre

• watt

• dioptre

• cm

New Cartesian Sign Conventions are followed for-----

• spherical mirrors only

• spherical lenses only

• both spherical mirrors and lenses

The lens prescribed by an optician has power equal to + 2.0 D. This means the lens prescribed is------

• Convex

• concave

The lens prescribed by an optician has power equal to + 2.0 D. The focal length is-------

• + 0.50 m.

• - 0.50 m.