IMPORTANT FORMULAE Relationship between focal length and radius of curvature of a mirror f=R/2 Mirror formula 1/v +1/u =1/f [ V-image distance , U-object distance, f-focal length] Magnification produced by mirror = - v/u – h’/h law = = 1n2 Snell’s Absolute refractive index n = c/v Lens formula 1/v 1/u = 1/f – Magnification produced by = v/u lens h’/h Power of lens P =1/f when focal length is in D cm’s P=100/f RAY DIAGRAMS Fig 10.1 NATURE, IMAGE AND ITS FORMATION (CONCAVE MIRROR) FIG 10.2 – NATURE, IMAGE AND ITS FORMATION (CONVEX MIRROR) Object at infinity Object between infinity and pole Fig- 10.3 NATURE, IMAGE AND ITS FORMATION (CONVEX LENS)
IMPORTANT FORMULAE Relationship between focal length and radius of curvature of a mirror f=R/2 Mirror formula 1/v +1/u =1/f [ V-image distance , U-object distance, f-focal length] Magnification produced by mirror – h’/h = - v/u Snell’s law = = 1n2 Absolute refractive index n = c/v Lens formula 1/v – 1/u = 1/f Magnification produced by lens h’/h = v/u Power of lens P =1/f when focal length is in cm’s P=100/f D RAY DIAGRAMS Fig 10.1 NATURE, IMAGE AND ITS FORMATION (CONCAVE MIRROR) FIG – 10.2 NATURE, IMAGE AND ITS FORMATION (CONVEX MIRROR) Object at infinity Object between infinity and pole Fig- 10.3 NATURE, IMAGE AND ITS FORMATION (CONVEX LENS)
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