Optics
In which of the following the final image is erect?
DoubtBuddy
Single Choice
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
AA convex lens of focal length 50 cm
BA concave lens of focal length 50 cm
CA convex lens of focal length 5 cm
Correct Answer
DA concave lens of focal length 5 cm
Solution
A convex lens is also used as a simple microscope. The object is kept between the focal length and mirror so that a virtual, erect and magnified image is formed. Smaller focal length has more power and is suitable for larger magnification. Hence, convex lens of focal length 5 cm is preferred.
SIMILAR QUESTIONS
Optics
An optical instrument used for angular magnification has a $$25$$ D objective and a $$20$$ D eyepiece. The tube length is $$25$$ cm when the eye is least strained. Whether it is a microscope or a telescope?
Optics
The limit of resolution of microscope, if the numerical aperture of microscope is $$0.12$$, and the wavelength of light used is $$600\ nm$$, is:
Optics
A student measures the thickness of a human hair by looking at it through a microscope of magnification $$100$$. He makes $$20$$ observations and finds that the average width of the hair in the field of view of the microscope is $$3.5$$ $$mm$$. What is the estimate on the thickness of hair?
Optics
The focal length of objective and eye lens of a microscope are $$4\ cm$$ and $$8\ cm$$ respectively. If the least distance of distinct vision is $$24\ cm$$ and object distance is $$4.5\ cm$$ from the objective lens, then the magnifying power of the microscope will be
Optics
Finger prints are observed by the use of
Optics
A person using a lens as a simple microscope sees an
Optics
The separation between two microscopic particles is measured PA and PB by two different lights of wavelength 2000 Ao and 3000 Ao respectively, then
Optics
Draw a neat labelled ray diagram to show the formation of image by a magnifying glass. State three characteristics of the image.
Optics
Where is the object placed in reference to the principal focus of a magnifying glass, so as to see its enlarged image? Where is the image obtained?
Contact Details
- community@doubtbuddy.in
- M3M Cosmopolitian, Sector 66, Golf Course Extension Road, Gurgaon
- Policy Terms