An object is placed 30 cm from a concave spherical mirror witha radius of curvat

Question

An object is placed 30 cm from a concave spherical mirror witha radius of curvature of 40 cm .which of the following describes the image ? a) virtual and located at infinity from the mirror b) real and located 60 cm from the mirror c) real and located 120 cm from the mirror d) virtual and located 60 cm from the mirror e) virtual and located 120 cmfrom the mirror An object is placed 30 cm from a concave spherical mirror witha radius of curvature of 40 cm .which of the following describes the image ? a) virtual and located at infinity from the mirror b) real and located 60 cm from the mirror c) real and located 120 cm from the mirror d) virtual and located 60 cm from the mirror e) virtual and located 120 cmfrom the mirror

Explanation / Answer

given that object distance = d0 = 30cm radius of curvature = R = 40cm focal length = f = R/2 = 40cm/2 = 20cm    from the mirror eq = 1/d0 + 1/di= 1/f                                    1/di = 1/f - 1/do                                      di = fd0/do - f                             plug in values di = 50cm

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