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in Physics by (122k points)
यदि सम्पर्क में रखे दो लेंसों की फोकस दूरियाँ क्रमशः `f_1` व `f_2` हो, तो उनके सम्पर्क संयोग से बने लेंस की तुल्य फोकस दूरी होगी
A. `(f_1f_2)/(f_1-f_2)`
B. `(f_1+f_2)/2`
C. `(f_1f_2)/(f_1+f_2)`
D. `sqrt(f_1f_2)`

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