In this case (image at near point(D)). Find the angular magnification in terms of D and f.

m=1+D/f

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m=D/f

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m=1+f/D

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m=f/D

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Solution

The correct option is A
m=1+D/f

Hey, take 2-3 minutes and try to derive this on your own. You have all the knowledge you need! Then watch the next video for the explanation.

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Similar questions

Q. In this case (image at near point(D)). Find the angular magnification in terms of D and f.

If the ratio of sum of m terms and n terms of an A.P. is , m²:n² then prove that the ratio of its mth and nth terms will be 2m-1 : 2n-1.

I know the answer for this, but i want to confirm if this method is right because everywhere, the other method is given!

S(m)÷s(n) = m²/n²
On solving till a point, we get this equation

2an + mnd -nd = 2am + mnd -dm
→ 2an-nd = 2am-dm
→ n(2a-d) = m(2a-d)
→ n=m. ......(1)

In the 'to prove' statement,

LHS →
a+(m-1)d / a+(n-1)d

Replacing n with m (using 1)

a+(m-1)d/a+(m-1)d = 1/1 = 1

RHS →

2m-1/2n-1
Replacing n with m (using 1)
2m-1/2m-1
= 1/1
=1

Hence, LHS=RHS.

IS THIS CORRECT?