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Acids, Bases And Salts

Question
CBSEENSC10012929
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Two lenses of power + 6 D and + 2 D are kept in contact, will the focal length of combination increase or decrease?

Solution

Total power of combination = + 6D + 2D = +8D.

Since power of the combination of lenses increases, therefore, focal length of combination decreases. 

Focal length and power of the lens has inverse dependence.

Some More Questions From Acids, Bases and Salts Chapter

Give three points of differences between real and virtual images.

What is a mirror? Mention the different types of mirrors commonly used.

Define the following terms in connection with reflection of light:
Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.

State the laws of reflection of light.

Are the laws of reflection applicable to plane surfaces also valid for curved surfaces?

State the important properties of images formed by plane mirrors.

What is lateral inversion of an image ? What is the cause of lateral inversion?

What is a spherical mirror? What are the two different types of spherical mirrors?

Define the following terms in connection with spherical mirrors:
(i) Pole (ii) Centre of curvature (iii) Radius of curvature (iv) Principal axis (v) Linear aperture (vi) Angular aperture (vii) Principle focus (viii) Focal length  (ix) Focal plane.

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