30) Figure 24.45 shows an object and its image formed by a thin lens. (a) What i

Question

30) Figure 24.45 shows an object and its image formed by a thin lens. (a) What is the focal length of the lens and what type of lens (converging or diverging) is it? (b) What is the height of the image? Real or virtual?

00 CHAPTER 24 Geometric Optices orme () What is the focal length of the tens and what ty verging or diverging) is i?(b) What is the height of real or virtual? Object 6.50 mm 5.00 cm FIGURE 24.45 Proble 31. t Figure 24.-46 shows an mage formed (a) What is the focal length of the tens and what type verging or diverging) is it? (b) What is the height of th real or virtual? Image Object 1325 mn Opic cm

Explanation / Answer

lens make formula

1/f = 1/v + 1/u

v = image distance from lens

u = object distance from lens so

1/f = 1/-3 + 1/-8

f = - 2.182 cm

it is diverging lense virtual image

magnification m = hi / h0  = - (v/u) = -(-3/-8 )

hi   = 3/8 * 6.5 mm = 2.4375 mm

height of image = 2.4375 mm

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