IMPORTANT CONCEPT
Light of Class 9
MPORTANT CONCEPT
On the basis of the New Cartesian Sign Convention discussed above, we can draw the following conclusions for the spherical mirrors (concave as well as convex mirrors).
IN THE CASE OF CONCAVE MIRROR:
(i) For real and inverted image
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Focal length(f)= –ve Radius of curvature(R)= –ve Object distance (u)= –ve Object height(h)= +ve Image distance (v)= –ve Image height(h′)=–ve Magnification (m)= –ve |
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(ii) For virtual and erect image
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focal length(f)= –ve Radius of curvature(R)= –ve Object distance(u)= –ve Object height(h)= +ve Image distance(v)= +ve Image height(h′)= +ve Magnification (m)= +ve |
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IN CASE OF CONVEX MIRROR
A convex mirror always forms a virtual and erect image.
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Therefore for virtual and erect image: Focal length (f)= +ve Radius of curvature (R)=+ve Object distance (u)=–ve Object height (h)= +ve Image distance (v)=+ve Image height (h′)=+ve Magnification (m)= +ve |
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In the case of a convex mirror, for virtual and erect image, only object distance (u) is –ve and the remaining all distances are +ve.
- Introduction Light
- REFLECTION OF LIGHT
- LAWS OF REFLECTION
- Some Important Terms Related To Spherical Mirrors
- IMPORTANT CONCEPT
- REFRACTION OF LIGHT
- Mind Map
- SOME IMPORTANT TERMS RELATED WITH LIGHT
- Some Important Terms Used In The Reflection Of Light
- IMAGES
- PLANE MIRROR
- MIRROR FORMULA
- LINEAR MAGNIFICATION PRODUCED BY MIRRORS
- Solved questions
- Exercise 1
- Exercise 2
- Exercise 3
- Exercise 4 (True and False)
- Exercise 5 (Subjective)
