Identify the incorrect part of the sentence: A ray of light passing →Athrough→Bthe center of a thin lens →Ckeep its →Doriginal direction 

A a
B b
C c
D d

Correct Answer: c

Bissoy MCQ
#রাজশাহী বিশ্ববিদ্যালয় #উচ্চতর গণিত #বিপরীত ত্রিকোণমিতিক ফাংশন ও ত্রিকোণমিতিক সমীকরণ (Inverse Trigonometric Functions and Trigonometric Equations) #B ইউনিট ( অ-বাণিজ্য) : 2018-2019

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A circle passing through the pitch point with its center at the center of cam axis is known as
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একটি দ্বি-উত্তল অভিসারি লেন্সের প্রত্যেক পৃষ্ঠের বক্রতার ব্যাসার্ধ 30cm এবং গ্লাসের প্রতিসরাঙ্ক 1.50। লেন্সটির ফোকাস দৈর্ঘ্য কত হবে? (The radius of curvatures of both surfaces of a double convex lens are 30cm each and refractive index of glass is 1.50. What will be focal length of the lens?)
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