Physics Q13 – NEET-UG 2025

In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power

(p)

and magnification

(m)

for each lens will be, respectively –

Clue 1 of 3: Lens Combinations

When multiple thin lenses are placed in contact, their optical properties combine in specific ways for power and magnification.

🧠 Full Solution Path

● Video Walkthrough

Step 1: Understand Lens Combination Rules✦ Active

When multiple thin lenses are placed in contact, their combined power is the sum of their individual powers, and their combined magnification is the product of their individual magnifications.

Step 2: Calculate Combined Power○ Expand

Given that there are four similar thin convex lenses, and the power of each lens is $p$ . The total power of the combination, $P_{c o m b}$ , is the sum of the individual powers:

P_{c o m b} = p + p + p + p = 4 p

💡 Teacher's Secret Hint

Remember that power is additive for lenses in contact.

Step 3: Calculate Combined Magnification○ Expand

Given that the magnification for each lens is $m$ . The total magnification of the combination, $M_{c o m b}$ , is the product of the individual magnifications:

M_{c o m b} = m \times m \times m \times m = m^{4}

Therefore, the power of the combination is $4 p$ and the total magnification is $m^{4}$ . This corresponds to option (3).

💡 Teacher's Secret Hint

Magnification multiplies for a series of lenses.

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Physics Question 13 – NEET-UG 2025

Clue 1 of 3: Lens Combinations

🧠 Full Solution Path