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Most Important Selected Qs for JEE AdvancedPhysicsRay Optics

S _ 1 : When a concave mirror is held under water, its focal length increases. S ₂ : When a convex lens is held under water, its focal length increases. S ₃ : If electric field is zero at a point, the electric potential must also be zero at that point.

Options

  1. ATTT
  2. BF F F
  3. CF T F
  4. DT F T

Correct answer

C. F T F

Step-by-step solution

S ₁ : The focal length of a concave mirror depends only on its radius of curvature. aligned & s ₂: 1 f = ( n _ rel -1 ) ( 1 R ₁ - 1 R ₂ ) & n _ rel = n _ rel n _ surrounding & n _ surrounding n _ rel f aligned s₃: Since E= -d v d r : if E=0 V = constant not necessarily equal to zero

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