Question

the power of a lens is -1.5 diopter find its focal length​

Answer 1

Answer:

HERE IS YOUR ANSWER MATE...

Explanation:

DIAMETER OF LENS=  -1.5

focal length​=2

Answer 2

Answer:

$\huge\sf\mathbb\color{yellow} \underline{\colorbox{purple}{☠answer☠}}$

Explanation:

Given.

• P = - 1.5 D

To Find

• Focal length

Solution

• We have formula

$☛ \: \: \: \: p = \frac{1}{ƒ}$

• (p) = power
• (ƒ) =focal length

Now, we putting given value

$p = \frac{1}{ƒ}$

$⟹ \: \: \: - 1.5 = \frac{1}{ƒ}$

$⟹ \: \: \: \: \: ƒ = \frac{1}{ - 1.5}$

$⟹ \: \: \: \: \: ƒ = - \frac{100 \times 10}{15}$

$⟹ \: \: \: \: \: ƒ = - \frac{100 \times 2}{3}$

$⟹ \: \: \: \: \: ƒ = - \frac{ 200}{3}$

$\: \: \: \: ⟹ \: \: \: \: \: \: ƒ = - 66.7cm \:$

Therefore, the value of focal length be - 66.7 cm