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Geometrical Optics question

2025 · 8 Apr · Shift 2 · Q53
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Geometrical Optics question

2025 · 8 Apr · Shift 2 · Q53

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1
A concave-convex lens of refractive index 1.5 and the radii of curvature of its surfaces are 30 cm and 20 cm, respectively. The concave surface is upwards and is filled with a liquid of refractive index 1.3. The focal length of the liquid-glass combination will be
  1. A
    70011\frac{700}{11}11700​ cm
  2. B
    60011\frac{600}{11}11600​ cm
  3. C
    80011\frac{800}{11}11800​ cm
  4. D
    50011\frac{500}{11}11500​ cm
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