Optics two lenses of focal length 10cm and 20cm......

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Himanshu Pandey
but i got it thanks
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Himanshu Pandey
Abhishek sir it's answer is given 13.6cm not 15
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Himanshu Pandey
yes rubii mam page 1& 3 are different question
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Chandra dhawan
achromatic lens-doublet is formed by placing in contact a convex lens of focal length f1 and a concave lens of focal length f3....... I hope u understood it
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Chandra dhawan
f3* ...replace by f2.
Abhishek singh
For your first doubt. Achromatic double means, combination of two lenses such that the chromatic Aberration is removed. and it's condition is attached alongwith. Do read this comme...
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Abhishek singh
this method has already been discussed in one of your previous doubts. They have changed the language of question. But they have asked the same concept.
Abhishek singh Best Answer
Solution for second part of your question. Do ask doubts if any. actually powers are always add when lenses are in contact. but here the power itself is negative for Plano concave ...
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Abhishek singh
do remember these methods of solving questions.
Dhairya sharma
dear see attached.
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Dhairya sharma
see the solution for the first one.
Ruby negi
ohmega 1 and omega 2 in last page is dispersive power of lens 1 and lens 2.
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Ruby negi
page 1 and page 3 are different question, right?
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Dhairya sharma
dear in second question..... as we know total power should be sum of power of both lenses but it's negative due to direction of their focus distance. and the factor of two must be ...
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