Two lenses have powers +2 D and –3 D respectively. The power of combination is
Answers
Given data : Two lenses have powers +2 D and –3 D respectively.
To find : The power of the combination of the lenses.
Solution :
Power of the combination of two lenses can be calculated by summing up their individual powers.
Given, P₁ = +2D and P₂ = -3D.
Power of the combination of the lenses P₁, P2 is :
Combined power P = P₁ + P₂
⇒ P = (+2D) + (-3D)
⇒ P = +2D - 3D
⇒ Combined Power P = -D
Therefore, the power of the combination of +2D and -3D powered lenses is -D.
More data :
Their combined focal length is :
f = 1 / P metres
⇒ f = 1 / -1 meters
⇒ f = -1 meters
⇒ Focal length of combined lenses f = -100 centimeters
As the focal length is negative, the combined lenses are concave in nature.
Learn more :
1) What is the focal length of a convex lens of focal length 30cm. in contact with a concave lens of focal length 20cm?
https://brainly.in/question/5265175
2) Two lenses of power ‐3D and 1.5D are combined and resultant power and focal length of combined lenses . Find the nature
https://brainly.in/question/18270575
3) Define the power of combination of lenses?
https://brainly.in/question/3257929