2. Questions Bank
  3. 10th Class
  4. Science
  5. Human Eye and Colourful World

10th Class Science Human Eye and Colourful World Question Bank The Human Eye and the Colourful World

  • question_answer
    A person having a myopic eye uses a concave lens of focal length 50 cm. What is the power of the lens?

    A) 2 D                                        

    B) - 2 D     

    C) - 0.5 D                 

    D) 5 D

    Correct Answer: B

    Solution :

    The focal length of the concave lens is considered negative. \[\text{Focal length}=-\text{5}0\text{ cm}=-\frac{50}{100}\text{m}=-0.\text{5m}\] \[P=\frac{1}{-\,0.5},P=-\frac{1\times 10}{5}=-2D\]


You need to login to perform this action.
You will be redirected in 3 sec spinner