How are the distance of object (u), the distance of image (v), and focal length (f) of a lens-related?
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Refraction through Lenses and Optical Instruments question types
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Refraction through Lenses and Optical Instruments questions
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How is the magnification (m) produced by a lens related to the object distance (u) and the image distance (v)?
A convex lens produces on a screen an image twice the size of the object. If the position of image and object be interchanged, what will be the magnification then?
Name the lens for which magnification is always less than 1.
Name the lens for which magnification can be 1. For what position of the object will the magnification be 1?
If the lens is of focal length 25 cm. Calculate the power of the lens.
A convex lens is of focal length 20 cm. Find its power.
What will be the behaviour of a lens, if it is placed in water instead of air?
Out of the two lenses one concave and the other convex state which is a convergent or a divergent type of a lens. Give a reason for your answer.
State two applications a concave lens .
How will you decide whether a given piece of glass is a concave lens, convex lens, or a plane glass plate?
Do we expect any change in the position, nature, and size of the image
(i) formed by a concave lens,
(ii) with a change in the position of the object?
(i) formed by a concave lens,
(ii) with a change in the position of the object?
Point out the difference between a convex lens and a concave lens.
Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?
In sunglasses, both of its surfaces are curved, yet their behaviour is neither like a convex lens nor like a concave lens. State the reason.
If there is a convex lens of focal length 75 cm and a concave lens of focal length 40 cm, then calculate their combined power and combined focal length.
Why do we say that the ‘2F’ and ‘F’ points of a convex lens can be regarded as a sort of ‘turning points’ as far as the nature of the image formed by it is concerned?
Draw a neat diagram to explain the action of a convergent (convex) lens as a reading glass (or magnifying glass). State the characteristics of the image formed.
Complete the diagram to show the formation of the image of the object AB.
(i) Name the Lens LL’.
(ii) Where is the image of the object AB formed?
(iii) State three characteristics of the image.
(i) Name the Lens LL’.
(ii) Where is the image of the object AB formed?
(iii) State three characteristics of the image.
Can one bum a piece of paper in daylight by just using a convex lens instead of a match or any direct flame? Support your answer with the help of an appropriate ray diagram.
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