Question:
On Celcius scale the temperature of body increases by 40°C. The increase in temperature on Fahrenheit scale is: 
(1) 70°F 
(2) 68°F 
(3) 72°F 
(4) 75°F
                                                      JEE -2024
Solution:                
An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D. Focal length of each of the convex lens is : (1) 20 cm (2) 50 cm (3) 500 cm (4) 25 cm JEE -2024

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