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A biconvex lens of focal length f forms ...

A biconvex lens of focal length f forms a circular image of radius r of sun in focal plane . Then which option is correct

A

`pi r^(2) prop f`

B

`pi r^(2) prop f^(2)`

C

If lower half part is converted by black sheet, then area of the imge is equal to `pi r^(2)//2`

D

If f is doubled, intensity will increase.

Text Solution

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The correct Answer is:
B
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MOTION-WAVE OPTICS -EXERCISE - 4 (Level - II) Previous Year | JEE Main
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  2. AB and CD are two slabs. The medium between the slabs has refractive i...

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  3. A biconvex lens of focal length f forms a circular image of radius r o...

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  4. Fig. shows a surface XY separating two transparent media, medium 1 and...

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  5. Fig. shows a surface XY separating two transparent media, medium 1 and...

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  6. Fig. shows a surface XY separating two transparent media, medium 1 and...

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  7. In a Young's double slit experiment, the separation between the two sl...

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  8. Column I shows four situations of standard Young’s double slit arrange...

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  9. A light ray travelling in glass medium is incident of glass- air inter...

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  10. Yong's double-slit experiment is carried out by using green, red and b...

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  11. In the Young's double slit experiment using a monochromatic light of w...

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  13. A light source, which emits two wavelength lamda(1)=400nm and lamda(2)...

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  14. A Young's double slit interference arrangement with slits S(1) and S(2...

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  15. While conduction the Young's double slit experiment, a student replace...

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  16. In a Young's double slit experiment, the slit separation d is 0.3 mm a...

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