# A simple microscope has a magnifying power of `
Question:

A simple microscope has a magnifying power of $3^{\prime} 0$ when the image is formed at the near point ( $\left.25 \mathrm{~cm}\right)$ of a normal eye.

(a) What is its focal length?

(b) What will be its magnifying power if the image is formed at infinity?

Solution:
{"ft_lang_label":"__label__en","ft_lang_prob":0.9243562,"math_prob":0.99315345,"size":277,"snap":"2023-40-2023-50","text_gpt3_token_len":74,"char_repetition_ratio":0.113553114,"word_repetition_ratio":0.045454547,"special_character_ratio":0.27797833,"punctuation_ratio":0.10526316,"nsfw_num_words":0,"has_unicode_error":false,"math_prob_llama3":0.98504335,"pos_list":[0,1,2,3,4,5,6],"im_url_duplicate_count":[null,null,null,null,null,1,null],"WARC_HEADER":"{\"WARC-Type\":\"response\",\"WARC-Date\":\"2023-10-01T22:18:23Z\",\"WARC-Record-ID\":\"<urn:uuid:dee07483-7151-47e5-acf4-c527106af242>\",\"Content-Length\":\"33701\",\"Content-Type\":\"application/http; msgtype=response\",\"WARC-Warcinfo-ID\":\"<urn:uuid:10869404-63de-484b-bd98-c3528a03583d>\",\"WARC-Concurrent-To\":\"<urn:uuid:efae635e-0774-4370-82e3-07384f10cfb2>\",\"WARC-IP-Address\":\"104.26.13.203\",\"WARC-Target-URI\":\"https://www.esaral.com/q/a-simple-microscope-has-a-magnifying-power-of-72677\",\"WARC-Payload-Digest\":\"sha1:W7GXNK3D2OUBK4TBMQPFUFVTBUHNWHCN\",\"WARC-Block-Digest\":\"sha1:5UVGMB3MCZUWXIRZKUYMP2J4QMR7XSMW\",\"WARC-Identified-Payload-Type\":\"text/html\",\"warc_filename\":\"/cc_download/warc_2023/CC-MAIN-2023-40/CC-MAIN-2023-40_segments_1695233510941.58_warc_CC-MAIN-20231001205332-20231001235332-00343.warc.gz\"}"}