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Which of the following is NOT correct about image formation by a convex lens? I. Object at infinity, image real and erect II. Object at F1, image real and erect III. Object at 2F1, image virtual and erect
Given below are four statements- (p) The second principal focus of a lens is the position of the object, real or virtual whose image is at infinity. (q) The second principal focus of a lens is the position of the image, real or virtual whose object is at infinity. (r) The first principal focus of a lens is the position of the object, real or virtual whose image is at infinity. (s) The first principal focus of a lens is the position of the image, real or virtual whose object is at infinity.  Examine the above statements and find which among then are correct. 
 Which of the following statements is/are true of the human eye lens? Choose the correct answer from the code given below:  (i) It is a convex lens (ii) It is a concave lens (iii) It is a convex lens of variable focal length (iv) It forms a real and inverted image of a distant object at the retina
Consider the following statement: A ray of light passing through the optical centre of a convex lens emerges without any deviation after refraction. A ray of light passing through the first principal focus of a convex lens  emerges parallel to the principal axis after refraction. A ray of light passing through the optical centre of a convex lens emerges parallel to the principal axis after refraction. Which one of the following statements INCORRECT?
Consider the following statement 1. When the object is placed at infinity of the convex mirror, then the image is formed at the focus. 2. The image formed by a convex mirror is always real, inverted, and smaller in size. 3. When the object is placed at infinity and pole of the convex mirror, then the image is formed at the focus. Which of the following statements is CORRECT?
Which of the following statements are always true? (i) When the object is placed nearer to the focal point of a converging lens the image gets bigger. (ii) When the object is placed farther away from the converging lens, the image gets smaller. (iii) When the object is placed very far away from the converging lens, the image distance approaches focal length.
To obtain a virtual enlarged erect image on the same side of a convex lens after refraction, where should the object be placed? 
Match the following (a) Concave mirror (i) A diverging lens (b) Concave lens (ii) Magnifying glass (c) Convex mirror (iii) Dentist mirror (d) Convex lens (iv) Rear view mirror
What is the relative size of the virtual and erect image formed by the convex lens?
In a convex mirror, when the object is at infinity then which of the following is correct? I. Nature of image is virtual and erect II. Size of the image is point sized