Verified Solution • 2025–26 Session moderate

QJEEM25Phdc3d: JEE Main 2025 Physics - Class 12 JEEM25Phdc3d Solution: A photograph of a landscape is captured by a drone camera at a…

A photograph of a landscape is captured by a drone camera at a height of 18 km . The size of the camera film is 2 cm×2 cm2 \mathrm{~cm} \times 2 \mathrm{~cm} and the area of the landscape photographed is 400 km2400 \mathrm{~km}^2 . The focal length of the lens in the drone camera is :

Multiple Choice Options

  • A 2.8 cm
  • B 0.9 cm
  • C 2.5 cm
  • D 1.8 cm

Step-by-Step Verified Solution

JEE Main 2025 (Online) 24th January Evening Shift Physics - Geometrical Optics Question 3 English Explanation

H=18 km Size of camera film =2 cm×2 cmAimage =400 km2x=20×103 m=2×104 my=2×10−2 mxy=106=18Kmff=18×10−3 m=18 mmf=1.8 cm

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