Question Answers

Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 19 - Optical Instruments > An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively.

An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively.

An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively.