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Two lenses of powers, 15D and +5D are in...

Two lenses of powers, 15D and +5D are in contact with each other forming a combination lens. What is the focal length of the combination?

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BINA LIBRARY-Optics-I-EXERCISE
  1. Calculate the focal length of the combination of a convex lens of foca...

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  2. A converging lens has focal length of 20 cm in air. It is made of a ma...

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  3. Two lenses of powers, 15D and +5D are in contact with each other formi...

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  4. The refractive index of a prism of angle 60 degree is 1.62 for sodium ...

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  5. A ray of light incident on an equilateral glass prism shows minimum de...

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  6. A ray of light passes through an equilateral prism such that the angle...

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  7. An astronomical telescope of magnifying power 10 consists of two thin ...

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  8. A near point of hypermetropic person is 50 cm from the eye. What is th...

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  9. An astronomical telescope uses two lenses of powers 10 dioptre and 1 d...

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  10. The focal length of a convex lens of R.I. 1.5 in air is 2 cm. The foca...

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  11. Time taken by sunlight to pass through a window of thickness 4 mm whos...

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  12. Radius of curvature of a convex mirror is 40 cm and the size of the ob...

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  13. A convex lens has a focal length f. It is cut into two parts along a l...

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  14. Two thin lenses of focal lengths f1, and f2 are placed co-axially in ...

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  15. The plane surface of a plano convex lens of focal length f is silvered...

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  16. The magnifying power of a telescope is m. If the focal length of the e...

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  17. When red glass is heated in a dark room it seems

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  18. Focal length of a convex lens will be maximum for

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  19. Rainbow is due to a combination of

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  20. An astronaut in a spaceship sees the sky as

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