Question

An electric lamp and a screen are placed an a table,in a line at a distance of 1m.In what positions of convex lens of focal length of f=21cm will be the imeage of lamp be sharp?

Answer 1

HERE YOUR ANSWER:

The following steps are to be taken to solve the query:

1) Using the distances in the diagram above we get u = - x and v = d - x.

2) Now, apply the lens formula and find the relation between the distances.

You will get a quadratic relation between x,

f and d as x² - xd + fd = 0 -------(1)

3) Substitute the value of d = 100 cm

and f = 21 cm to find the value of x.

so when we put f=21 and d=100finally

Substituting these values in equation 1,

we get

X1 =70cm and

X2 =30cm.

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hope it helps you..!!

Answer 2

Answer:

Explanation:hope you will mark me as brainliest