two lenses are used together. the first lens, f1 = 15 cm, is located 25.0 cm fro

Question

two lenses are used together. the first lens, f1 = 15 cm, is located 25.0 cm from the second lens, f2 = 8 cm. an object is located 45 cm in front of the first lens. determine the positions of the two images formed by this combination. which is real and which is virtual. two lenses are used together. the first lens, f1 = 15 cm, is located 25.0 cm from the second lens, f2 = 8 cm. an object is located 45 cm in front of the first lens. determine the positions of the two images formed by this combination. which is real and which is virtual. two lenses are used together. the first lens, f1 = 15 cm, is located 25.0 cm from the second lens, f2 = 8 cm. an object is located 45 cm in front of the first lens. determine the positions of the two images formed by this combination. which is real and which is virtual.

Explanation / Answer

use the formula 1/f = 1/u + 1/v for each of the lens

so for first lens

1/15 = 1/25 + 1/v1

1/v1 = 1/15 - 1/45

v1 = 22.5 cm is the image of first lens (this is real image )

so object distance for second lens = u2 = 25 - 22.5 = 2.5 cm

so for now seconf lens

so

1/f2 = 1/u2 + 1/v2

1/v2 = 1/8 - 1/2.5

v2 = -3.6 cm (this is virtual image)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.