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Find Angle That Emergent Ray Will Make With Optic Axis | SBT Ray Optics QNO 135 | JEE Advanced 2026

In this video, we solve Question 135 from the SBT Book (Ray Optics).

An equiconvex lens has:
• Radius of curvature R = 10 cm (both surfaces)
• Thickness at center = 2 cm
• Incident ray making 2° with optic axis
• Refractive indices of media as given

We calculate:

• Refraction at first surface
• Refraction at second surface
• Effect of finite thickness
• Angular deviation through thick lens
• Final angle made by emergent ray with optic axis

This problem tests your understanding of:
✔ Refraction at spherical surfaces
✔ Sign convention
✔ Small angle approximation
✔ Thick lens behavior

Highly important for JEE Advanced 2026 / 2027 aspirants and serious Physics learners.

Watch till the end for complete derivation and conceptual clarity.

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