Find the maximum magnifying power of a compound Microscope having a 25 diopter lens as the objective, a 5 diopter lens as the eyepiece and the separation 30 cm between the two lenses. The least distance for clear vision is 25 cm.
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Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm.
Hint — P = 1/f where f is in metre. Its unit is Dioptre. Lens is convex in the first case and concave in the second case. Power is equal...
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Find the focal length of a lens of power -2.0 D. What type of lens is this?
Given Power P =- 2.0D If f is the focal length of lens, then P =1/f gives f=1/P=1/-2.0 m=-50cm Negative sign shows that lens is concave. Thus focal length oflens is 50 cm and it...
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A doctor has prescribed a corrective lens of power + 1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Given P=+ 1.5D As P=1/f (in metre) , Focal length, f =1/P=1/1.5=0.667m=66.7cm As power of prescribed lens is positive, the lens is converging (or convex) lens.
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Give the SI unit of power of lens. State whether the power of a converging lens is positive or negative.
The SI unit of power of a lens is dioptre. The power of a converging lens is positive as f is +ve.
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When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings.
(a) Stomata ------
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The image formed by an objective of a compound microscope is.
The image formed by an objective of a compound microscope is real and enlarged
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A symmetric double convex lens is cut in two equal parts by a plane containing the principal axis. If the power of the original lens was 4 D,
The correct answer is (c) 4 D EXPLANATION: The plane containing the principal axis will cut the lens in two semicircular pieces and each piece will be a lens having the same...
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A convex lens is made of a material having refractive index 1.2. Both the surfaces of the lens are convex.
(b) a divergent lens EXPLANATION: The µ of the convex lens is greater than air so it will act as a convergent lens in the air. When it is dipped in water...
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The image formed by an objective of a compound microscope is (a) real and diminished (b) real and enlarged
(b) The image formed by objective lens of compound microscope is real and enlarged, while final image formed by compound microscope is inverted, virtual, enlarged and at a distance D...
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Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more.
(a) RP ∝ diameter of objective.
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