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Combination Of Lenses...

Combination Of Lenses

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Two coaxial thin lenses are placed in contact with each other and a small object is placed at a distance of 20cm from the combination of lenses. The focal length of each lens is 30 cm. What will be the distance between the object and the image when both the lenses are (i) convex (ii) concave

Two lenses A and B have focal length of +20 cm and, -10 cm, respectively. a) What is the nature of lens A and lens B? b) What is the power of lens A and lens B? What is the power of combination if lenses A and B are held close together?

a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends. b) What is the unit of power of a lens? Define the unit of power of a lens. c) A combination of lenses for a camera two converging lenses of focal length 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.

We combined a convex lens of focal length f_(1) and concave lens of focal lengths f_(2) and their combined focal length was F . The combination of these lenses will behave like a concave lens, if

Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. What type of lens will the combination of lenses be?

The power of two lenses are + 6 D and - 4 D , determine the power of the combination of two lenses.

If two lense with focal lengths 10 cm and -20 cm respectively are kept in contact with each other, what will be the effective power of the combination of the lenses ?

The focal length of a combination of two lenses is doubled if the separation between them is doubled. If the separation is increased to 4 times, the magnitude of focal length is