JEE Main 2022 · 27 Jun · Shift 2 · Physics Q46

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PhysicsSingle correct+4 / -1Question 46 of 90

A convex lens has power P. It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figures). Choose the incorrect option for the reported pieces.

A biconvex lens cut along the principal axis into two halves; one half (L1) is kept whole and the other is cut perpendicular to the axis into two plano-convex pieces L2 and L3.

Power of

L_1=\dfrac P2

Power of

L_2=\dfrac P2

Power of

L_3=\dfrac P2

Power of

L_1=P

Answer and worked solution

Official answer: A

Cut along the axis. Each half keeps both curved faces, so $L_1$ keeps power $P$ . Cut perpendicular to the axis. $L_2$ and $L_3$ are plano-convex, each $\frac P2$ .

Incorrect statement. "Power of $L_1=\frac P2$ ".

(A)

Topics:Thin lenses and lens maker's formula

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JEE Main 2022 · 27 Jun · Shift 2, Physics question 46