Aniket from Std. X uses spectacles. The power of the lenses in his spe

1.	Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is -0.5 D.i. State the type of’ lenses used in his spectacles.ii. Name the defect of vision Aniket is suffering from.iii. Find the focal length of the lenses used in his spectacles.
Answer» i. Concave lenses are used in the spectacles used by Aniket. ii. Aniket is suffering from myopia (nearsightedness). iii. Focal length of the lenses used in his spectacles = \(\frac{1}{power\,of\,the\,lens}=\frac{1}{-0.5\,D}\) = -2 m (Concave lens ∴ Minus sign)

Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is -0.5 D.i. State the type of’ lenses used in his spectacles.ii. Name the defect of vision Aniket is suffering from.iii. Find the focal length of the lenses used in his spectacles.

Answer»

i. Concave lenses are used in the spectacles used by Aniket.

ii. Aniket is suffering from myopia (nearsightedness).

iii. Focal length of the lenses used in his spectacles = \(\frac{1}{power\,of\,the\,lens}=\frac{1}{-0.5\,D}\)

= -2 m (Concave lens ∴ Minus sign)