1 Real images are always inverted.
2 Virtual images are always upright.
3 Diverging lens (concave) produce only small virtual images.
4 Light rays bend away from the normal as they gain speed and a longer wavelength by entering a slower (n) medium {frequency remains constant}.
5 The focal length of a converging lens (convex) is shorter with a higher (n) value lens or if blue light replaces red.
2 Virtual images are always upright.
3 Diverging lens (concave) produce only small virtual images.
4 Light rays bend away from the normal as they gain speed and a longer wavelength by entering a slower (n) medium {frequency remains constant}.
5 The focal length of a converging lens (convex) is shorter with a higher (n) value lens or if blue light replaces red.
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