a convex lens of power 6 diaptre is placed is contact with a concave lens of power -4 diaoptre what will be the nature and focal length of this combination

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Q. A convex lens of power

+ 6

dioptre is placed in contact with a concave lens of power

- 4

dioptres. What will be the nature and focal length of this combination?

Question 8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
(c) A concave lens has 4 dioptre power having a focal length 0.25 m.
(d) A concave lens has 4 dioptre power having a focal length -0.25 m.

Q. A convex lens of focal length 50 cm, a concave lens of focal length 50 cm and another concave lens of focal lens 20 cm are placed in contact. The power of this combination in dioptres will be:

Q. An eye specialist prescribes spectacles having a combination of a convex lens of focal length

40 cm

in contact with a concave lens of focal length

25 cm

. The power of this lens combination in Dioptre is:

A convex lens of power 5 D and a concave lens of power 7.5 D are placed in contact with each other. What is the :
(a) power of this combination of lenses?
(b) focal length of this combination of lenses?

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