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  5. Light - Reflection and Refraction

10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    The sun subtends an angle of \[1/2{}^\circ \] at the surface of the earth. A converging lens of focal length 100 cm is used to obtain the image of the sun on to a screen. The diameter of the image formed is nearly

    A)  1 mm                   

    B)         9 mm  

    C)  18mm                 

    D)         150cm

    Correct Answer: B

    Solution :

     For such numerical of length of image, whether in lenses or in mirrors, remember the following formula:                 \[I=f\theta \], where, \[\theta \] should be in radians \[\therefore \]  \[I=100\times \frac{1}{2}\times \frac{1}{57\cdot 3}\]


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