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If the image formed by a lens is always ...

If the image formed by a lens is always diminished and erect, what is the nature of the lens?

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Concave lens
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The image formed by a concave lens is always virtual.

The image formed by a concave lens is always ………….. .

If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens ? Draw a ray diagram to justify your answer. If the numerical value of power of this lens is 10 D, what is its focal length in cartesian system ?

The image formed by a convex lens is always real. Is it true?

A object is placed 20 cm from the convex lens, with focal length 40 cm. The image formed is virtual and erect. What will be power of the lens?

LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. A lens forms a real image 3 cm high of an object 1 cm high. If the sep...

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  2. An object 50 cm tall is placed on the principle axis of a convex lens....

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  3. If the image formed by a lens is always diminished and erect, what is ...

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  4. Copy and complete the diagram below to show what happens to the rays o...

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  5. Which type of lenses are: a) Thinner in the middle than at the edges...

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  6. A ray of light is going towards the focus of a convex lens. Draw a ray...

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  7. a) What type of images can a convex lens make? b) What type of image...

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  8. Take down this figure into your answer book and complete the path of t...

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  9. Fill in the following blanks with suitale words: A) A convex lens ……...

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  10. Things always look small on viewing through a lens. What is the nature...

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  11. An object lies at a distance of 2f from a concave lens of focal length...

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  12. Show by drawing a ray-diagram that the image of an object formed by a ...

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  13. Give the position, size and nature of image formed by a concave lens w...

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  14. Which type of lens is: a) a converging lens, and which is (b) a diverg...

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  15. With the help of a diagram, explain why the image of an object viewed ...

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  16. How would a pencil look like if you saw it through a) a concave lens, ...

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  17. a) An object is placed 10 cm from a lens of focal length 5 cm. Draw th...

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  18. a) Construct ray diagrams to illustrate the formation of a virtual ima...

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  19. When an object is kept at any distance in front of a concave lens, the...

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  20. When sunlight is concentrated on a piece of paper by a spherical mirro...

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