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प्रश्न
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उत्तर
1 nm = 10 Å
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संबंधित प्रश्न
Find the focal length of a lens of power −2.0 D. What type of lens is this?
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
Consider two statements A and B given below:
A: real image is always inverted
B: virtual image is always erect
Out of these two statements:
Which type of lens has (a) a positive power, and (b) a negative power?
What is the nature of a lens having a power of + 0.5 D?
Fill in the following blank with suitable words :
The reciprocal of the focal length in metres gives you the _________ of the lens, which is measured in ___________.
A diverging lens has a focal length of 0.10 m. The power of this lens will be:
A convex lens produces a double size real image when an object is placed at a distance of 18 cm from it. Where should the object be placed to produce a triple size real image?
Consider the situation described in the previous problem. Where should a point source be placed on the principal axis so that the two images form at the same place?
A convex lens with radii of curvature R1 = R2 is immersed in water. Assuming that the refractive indices of glass and water are 3/2 and 4/3 respectively, its focal length f1 in comparison to that in air, f, is ______.
