Physics, asked by AFridiiiKhaaannn, 1 year ago

The person cannot see objects clearly beyond 50cm,The power of lens to correct the vision is .+5d .-0.5D .-2D .+2D GIVE REASON

Answers

Answered by Rishant
54
-2D as P=1/f , first also 50 cm =1/2 m therefore P= 2D moreover concave lens are used so power is -

AFridiiiKhaaannn: CORRECT ANSWERR , ONE MORE QUESTION which class are you on now
Rishant: 12
AFridiiiKhaaannn: how did you knew t is concave
Rishant: because in near sightedness we use concave lens
Answered by abu7878
18

Answer:

The power of lens to correct the vision is +2D.

Explanation:

The person cannot see objects beyond 50 cm clearly, as given, power of lens correction will be calculated as follows –

Given is the focal length f = 50 cm

Power P = ?

From the formula of power of lens, we have -  

\bold{P=\frac{1}{f}}

\begin{array}{l}{\Rightarrow f=50 \mathrm{cm}} \\ {\Rightarrow P=\frac{1}{50 \mathrm{cm}}}\end{array}

\begin{array}{l}{\Rightarrow P=\frac{1}{0.5 m}} \\ {\Rightarrow P=\frac{10}{5}} \\ {\Rightarrow P=\frac{1}{2}}\end{array}

Therefore, P = 2D.

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