Light - Reflection and Refraction

CBSE 2027 sample paper · 1 mark

A student wants to determine the focal length of a convex lens using sunlight. Which of the following practical procedures will give the most accurate result?

1. Move the lens close to a wall and measure the blurred circle.
2. Hold the lens above a sheet of paper and adjust until the smallest, brightest spot is formed.
3. Measure the thickness of the lens with a scale.
4. Look through the lens at a distant object.

CBSE 2027 sample paper · 1 mark

Assertion (A): The apparent depth of a coin in water is less than its real depth. Reason (R): Light bends away from the normal when it travels from water to air.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

CBSE 2027 sample paper · 2 marks

A. State Snell’s Law of refraction. B. Define the refractive index of a material with respect to another material giving the mathematical expression.

CBSE 2026 sample paper · 1 mark

Arnav was making notes and he wrote down the following statements from his understanding of reflection from curved surfaces. I. Concave mirrors can produce both real and virtual images depending on the position of the object. II. Convex mirrors always produce real, inverted images regardless of the object’s position. III. In both concave and convex mirrors, the image location can be determined using the mirror formula (1)/(f)=(1)/(v)+(1)/(u) where f is the focal length, v is the image distance, and u is the object distance. Choose from the following the correct option that lists the correct statements about reflection from curved surfaces.

1. I and II
2. I, II and III
3. II and III
4. I and III

CBSE 2026 board paper · 1 mark

A convex lens of focal length 15 cm, is forming a real image. If the size of image is same as the size of object, then position of object and position of image will be, respectively :

1. – 15 cm and – 15 cm from lens
2. – 15 cm and + 15 cm from lens
3. – 30 cm and + 30 cm from lens
4. – 30 cm and – 30 cm from lens

CBSE 2026 board paper · 1 mark

From the following options choose the one which gives negative magnification greater than one :

1. Concave mirror; Nature of image – real
2. Concave mirror; Nature of image – virtual
3. Convex mirror; Nature of image – real
4. Convex mirror; Nature of image – virtual

CBSE 2026 board paper · 1 mark

Rays from the sun converge at a point 25 cm behind a convex lens. The distance at which an object be placed in front of the lens to get a virtual image, is :

1. 20 cm
2. 40 cm
3. 50 cm
4. More than 50 cm

CBSE 2026 board paper · 1 mark

Pushkar was studying a light phenomenon and wrote down the following statements in that context : (i) A concave mirror can be used as a shaving mirror because it can form an enlarged, virtual image when the object is placed between the pole and focus. (ii) A convex lens always forms real, inverted images, regardless of the position of the object. (iii) The relationship between object distance (u), image distance (v) and focal length (f) of the lens is given by (1)/(f) = (1)/(v) - (1)/(u). Choose the option enlisting all the correct statements :

1. (i) and (ii)
2. (i) and (iii)
3. (ii) and (iii)
4. (i), (ii) and (iii)