A boy uses spectacles of focal length 60 cm. Name the defect of vision he is suffering from which lens is used for the correction of this defect? Compute the power of this lens

- 1.67 D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

1.67 D

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

0.067 D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

-.0.67 D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B 1.67 D
$\begin{matrix} T h e p e r s o n i s s u f f e r i n g f o r m m y o p i a . p = \frac{1}{f} N o t e - b e f o r e a p p l y i n g t h e f o r m u l a c h e c k i f t h e g i v e v a l u e i s i n m e r t e r s . . . i n t h i s c a s e w e n e e d t o c o n v e r t i n t o m \frac{1}{0.6} = 1.67 D H e n c e, t h e o p t i n B i s t h e c o r r e c t a n s w e r . \end{matrix}$

Suggest Corrections

Similar questions

Q. A boy uses spectacles of focal length

- 50 c m

.Name the defect of vision he is suffering from.

A person suffering from an eye defect uses a lens of power -1D. Name the defect he is suffering from and the nature of the lens used

Q. A person needs a lens of power

- 2.5 D

for correcting his vision. What is the defect of vision that the person is suffering from? Also, find the focal length of the lens.

Name the eye defect in which eye lens becomes cloudy or milky. Mention the method for its correction. A person uses a lens of power -1.0 D for correcting his distant vision and for correcting his near vision he uses a lens of power + 2.0 D. Calculate the focal length of the lenses required to correct these defects. Explain why a normal eye is not able to see clearly the objects placed closer than the near points.

(a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.

(b) We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.

Join BYJU'S Learning Program

A boy uses spectacles of focal length 60 cm. Name the defect of vision he is suffering from which lens is used for the correction of this defect? Compute the power of this lens

The correct option is B 1.67 DThepersonissufferingformmyopia.p=1fNote−beforeapplyingtheformulacheckifthegivevalueisinmerters...inthiscaseweneedtoconvertintom10.6=1.67DHence,theoptinBisthecorrectanswer.